I think the robbins way
is right. But i couldnt
under stand why did
he multiply the result
by 2

the chances are
none in the fist box
and all in the other
box=4C0=1
1 in fist and 3 in
second=4C1=4
2 in first and 2 in
second=4C2=6
3 in first and 1 in
second=4C3=4
4 in fist and none in
second=4C4=1

as for question have to post atleast 1 letter in 2 box.. i think the posibilty to post 4 letter in 2 box is 3 ..cause
1st box 1 letter and 2nd box 3 letter,
1st box 2 letter and 2nd box 2 letter,
1st box 3 letter and 2nd box 1 letter.

If the letters are thought to be unique than the answer is: 2*2*2*2=8
If the letters are thought to be identical(as in spam mails) than the answer is:
(5,0,0) (4,1,0) (3,2,0) (2,3,0) (1,4,0) (0,5,0)
(4,0,1) (3,1,1) (2,2,1) (1,3,1) (0,4,1)
(3,0,2) (2,1,2) (1,2,2) (0,3,2)
(2,0,3) (1,1,3) (0,2,3)
(1,0,4) (0,1,4)
(0,0,5)
1+2+3+4+5+6 = 21 ways
~Lester

Assume 1st box 4 letter and 2nd box no letter,
1st box 1 letter and 2nd box 3 letter,
1st box 2 letter and 2nd box 2 letter,
1st box 3 letter and 2nd box 1 letter,
1st box not post and 2nd box 4 letter,
1st box 3 letter and 2nd box 1 letter,

You are driving along in your car on a wild, stormy night,
it's raining heavily, when suddenly you pass by a bus stop,
and you see three people waiting for a bus:
An old lady who looks as if she is about to die.
An old friend who once saved your life.
The perfect partner you have been dreaming about.
Which one would you choose to offer a ride to,
knowing very well that there could only be one passenger in
your car?
This is a moral/ethical dilemma that was once actually used
as part of a job application.
* You could pick up the old lady, because she is going to
die, and thus you should save her first;
* or you could take the old friend because he once saved
your life, and this would be the perfect chance to ! pay
him back.
* However, you may never be able to find your perfect mate
again.

There are twelve consecutive flags at an equal interval of
distance. A man passes the 8th flag in 8 seconds. How many
more seconds will he take to pass the remaining 4 flags?

1.) In the coming state elections, Bharat Mata Party
(BMP) will contest for 77 assembly seats. As BMP's majority
vote bank is distributed amongst three communities viz. A,
B and C, it will give election tickets only to those
workers who belong to these communities. The workers of
communities B and C are split into factions. Every faction
of community B has 15 workers and that of community C has
25 workers. There were no factions among the workers
belonging to community A. If BMP gives a ticket to a
worker, it must give tickets to every other worker
belonging to the same faction. BMP distinguishes between
any two workers only on the basis of their communities. In
how many ways can BMP distribute its election tickets
giving at least one ticket to each community?

A watch which gains 5 secons in 3 min was set righr at 7
am . in the afternoon of the same day, when the watch
indicated quater past 4'0 clock the true time is (*** plz
give the explanation**)

Five racing drivers, Alan, Bob, Chris, Don, and
Eugene, enter into a contest that consists of 6 races. The
results of all six races are listed below:
Bob always finishes ahead of Chris.
Alan finishes either first or last.
Eugene finishes either first or last.
There are no ties in any race.
Every driver finishes each race.
In each race, two points are awarded for a fifth place
finish, four points for fourth, six points for third, eight
points for second, and ten points for first.
If Eugene finishes two places ahead of Chris in the first
race, all of the following will be true EXCEPT:
a) Bob finishes ahead of Don.
b) Chris finishes two places ahead of Alan.
c) Don finishes fourth.
d) Bob finishes immediately behind Eugene.
e) Chris finishes ahead of Bob.
2) Five racing drivers, Alan, Bob, Chris, Don, and
Eugene, enter into a contest that consists of 6 races. The
results of all six races are listed below:
Bob always finishes ahead of Chris.
Alan finishes either first or last.
Eugene finishes either first or last.
There are no ties in any race.
Every driver finishes each race.
In each race, two points are awarded for a fifth place
finish, four points for fourth, six points for third, eight
points for second, and ten points for first.
If Don finishes third in the third race, which of the
following must be true of that race?
a) Alan finishes first.
b) Eugene finishes first.
c) Bob finishes second.
d) Chris finishes second.
e) Alan finishes fifth.
3) Five racing drivers, Alan, Bob, Chris, Don, and
Eugene, enter into a contest that consists of 6 races. The
results of all six races are listed below:
Bob always finishes ahead of Chris.
Alan finishes either first or last.
Eugene finishes either first or last.
There are no ties in any race.
Every driver finishes each race.
In each race, two points are awarded for a fifth place
finish, four points for fourth, six points for third, eight
points for second, and ten points for first.
If Eugene's total for the six races is 36 points, which of
the following must be true?
a) Bob's total is more than 36 points.
b) Chris's total is more than 36 points.
c) Alan's total is 36 points.
d) Don's total is less than 36 points.
e) Don's total is 36 points.
4) Five racing drivers, Alan, Bob, Chris, Don, and
Eugene, enter into a contest that consists of 6 races. The
results of all six races are listed below:
Bob always finishes ahead of Chris.
Alan finishes either first or last.
Eugene finishes either first or last.
There are no ties in any race.
Every driver finishes each race.
In each race, two points are awarded for a fifth place
finish, four points for fourth, six points for third, eight
points for second, and ten points for first.
If Alan finishes first only once, and Don finishes second
exactly twice, the lowest total number of points that Bob
can earn in the race is:
a) 32 points.
b) 38 points.
c) 40 points.
d) 44 points.
e) 48 points.
5) Five racing drivers, Alan, Bob, Chris, Don, and
Eugene, enter into a contest that consists of 6 races. The
results of all six races are listed below:
Bob always finishes ahead of Chris.
Alan finishes either first or last.
Eugene finishes either first or last.
There are no ties in any race.
Every driver finishes each race.
In each race, two points are awarded for a fifth place
finish, four points for fourth, six points for third, eight
points for second, and ten points for first.
If Alan finishes first in four races, which of the
following could earn a total of fewer than 26 points in the
six races?
a) Bob only.
b) Chris only.
c) Don only.
d) Eugene of Chris.
e) Don or Chris.
6) Five racing drivers, Alan, Bob, Chris, Don, and
Eugene, enter into a contest that consists of 6 races. The
results of all six races are listed below:
Bob always finishes ahead of Chris.
Alan finishes either first or last.
Eugene finishes either first or last.
There are no ties in any race.
Every driver finishes each race.
In each race, two points are awarded for a fifth place
finish, four points for fourth, six points for third, eight
points for second, and ten points for first.
If Frank enters the third race and finishes behind Chris
and Don, which of the following must be true of that race?
a) Eugene finishes first.
b) Alan finishes sixth.
c) Don finishes second.
d) Frank finishes fifth.
e) Chris finishes third.