Interested to Buy Any Domain ? << Click Here >> for more details...
if a number is choosen between 100 and 999 includeing these
numberrs what is the provbabilty that the number selected
does not contain a 7 is
- 23 Answers
- 47292 Views
- Deshaw, Microsoft, Persistent, I also Faced
- E-Mail Answers
Answer Posted / shruti
here are 900 numbers between 100 and 999.
those that contain 7 are.....
107, 117, 127, ........ -- 10 of these
207, 217, 227, ........ -- 10 of these too
307, 317, 327, .......
....
9*10 numbers that end in 7.
170, 171, 172, 173, 174, 175, 176, (NOT 177 WE ALREADY COUNTED IT), 178, 179 -- 9 of these
270, 271, 272, 273, 274, 275, 276, (NOT 277 WE ALREADY COUNTED IT), 278, 279 -- 9 of these
...
and so on
so 9*9 numbers that have a middle digit of 7
and finally
700, 701, 702, 703, 704.................., but NOT
(707, 717, 727,....) or (770, 771, 772, 773, ....)
So that's (100 - 10 - 9) = 81 numbers that start with 7.
We had 900 numbers.
N = 900 - 90 - 81 - 81 = 648
So the probability is 648/900 = 0.72
| Is This Answer Correct ? | 5 Yes | 3 No |
Post New Answer View All Answers
A hotel has 10 storeys. Which floor is above the floor below the floor, below the floor above the floor, below the floor above the fifth.
If POINT + ZERO = ENERGY, then E + N + E + R + G + Y = ?
Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternately. Then the tank will be full in:
If m-4 is 7 more than n then m+9 is how much more than n+2
If the product of three consecutive int is 210,then sum of the two smaller ints is:
In a company 30% are supervisors and 40% employees aare male if 60% of supervisors are male what is the probability that is randomly choosen employee is a male or female?
Gaurav buys milk at Rs. 60 per litre, adds water to it and then sells it at Rs. 75 per litre. What should be the ratio of milk to water to get a profit of 37.5%?
A man runs towards the east direction and then takes his right. Then he takes a left and again 50 degrees to his right. What is the direction in which he is moving now?
When I was married 10 years back my wife was the sixth member of my family. Now I have a baby. Today my father was dead and I had a new baby. Now the average age of my family is the same as that when I was married. Find the age of my father when he was 60.
What is degree of a Relation?
hai friends i have finished my B.E CSE in 2009.now i have to get a interview opportunity from HP software ,chennai.please any one can send me the last year(2009) interview questions with answers for freshers.i want a full details about HP's interview question with answers,procedures also.such these one year i had try to get my job but still i have not get.so plese send me that what i said....by vijay,chennai
the plane question was asked.it took off from 7 degree 53' 6.1'' and landed at 8 degree 6' 43.5''.it takes 12 hours to travel between these points.then what will be local time at destination ?
If a worker gets late for his work he has to pay a fine of Rs 200 on the first day and the fine increases by 25 Rs per day. If he pays a total amount of Rs 9450, for how many days did he pay for?
GOOD is coded as 164 then BAD coded as 21.if ugly coded as 260 then JUMP?
Find the next series number 1, 1, 2, 3, 6, 7, 10, 11, ?
