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
- 46781 Views
- Deshaw, Microsoft, Persistent, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / jamesk
p = prob(1st digit not 7)*prob(2nd digit not 7)*prob(3rd
digit not 7)
=(8/9)*(9/10)*(9/10)
=0.72
Sandhya had it right except that there are 900 numbers
between 100 and 999 inclusive (not 899).
| Is This Answer Correct ? | 59 Yes | 6 No |
Answer / seiko
no 0f 7's in 100 to 200 is
107,117,127,137,147,157,167,170,171,172,173,174,175,176,177,
178,179,187,197.
so total of 19 numbers between 100 and 199
repeat that for 200-299, 300-399,...,600-699, 800-899, 900-
999, we have 19*8 = 152 occurences
for 700-799, all 100 of them contain a 7
so total numbers contain a 7 is 152 + 100 = 252
total numbers between 100 and 999 is 900
probability = (900-252)/900 = 0.72
| Is This Answer Correct ? | 51 Yes | 8 No |
Answer / ajeet
100-199------19
similarly for all ranges till 999 except for:
700-799----100
total no.containing 7's= 19*8+100=252
Therefore,
probability=(900-252)/900
= 648/900
= 0.72
| Is This Answer Correct ? | 10 Yes | 3 No |
Answer / mayank kumar
total numbers between 100 and 999 =900
number that have a digit 7 between 100 and 199 =19
similarly no. that have digit 7 between 200 and 699=5*19
number that have digit 7 between 700 and 799=100
number that have a digit 7 between 800 and 999 =2*19
so total number that have digit seven in them between 100 and 999 are=8*19+100 =252
so numbers that does not have 7 digit in them =900-252 =648
therefore required prob, p =648/900 = 0.72
| Is This Answer Correct ? | 6 Yes | 3 No |
Answer / 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 |
24. 13 kigs and 6 libs can produce 510 tors in 10 hrs, 8 kigs and 14 libs can produce 484 tors in 12 hrs.Find the rate of production of tors for kigs and libs. Express the answer in tors/hr.
3 Answers Caritor, Infosys, Secon,
consider expresion 'ab' . what happens when 'a' is divided by 'c' & 'b' is multiplied by 'c'.
a man purchased 6 stamps of rupees 1 and seven stamps of 50 paise.he paid Rs. 12. how much change he got back ?
A CLOCK SHOWED 5 MIN PAST 3'0 CLOCK ON SUNDAY EVENING WHEN THE CORRECT TIME WAS 3'0 CLOCK IT LOOSES UNIFORMLY AND WAS OBSERVED TO BE 10 MIN SLOW ON THE SUBSEQUENT TUESDAY AT 9PM . WHEN DID THE CLOCK SHOW THE CORRECT TIME(** PLEASE GIVE THE EXPLANATION ALSO***)
5 Answers FIITJEE, Infosys, TCS,
Sunny ate 100 apples in five days, each day eating 6 more than the previous day. How many apples did he eat on the first day?
A train travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs.What is the distance traveled
plese,send to me the sbi clarical bank exam form.
1 Answers State Bank Of India SBI, TCS,
pls send me the written test pattern of GE
In a class photograph, 5 girls are sitting in the front where as 20 boys are standing behind them. The corner two positions are reserved for the tallest boys of the class. What are the number of ways the students may be arranged?
If I have to measure all weights from 1 kg to 121 kg, what is the minimum number of weights I should keep? 1.1 2.5 3.13 4.21
1.area of trapezium?
Successive discounts of 10%, 20% and 20% are equal to a single discount of __
English 
