Technical - Find the probability of getting a number with 7 between 100 and 999 (both inclusive).

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Find the probability of getting a number with 7 between 100 and 999 (both inclusive).

Total Answers and Comments: 7

Last Update: July 21, 2006

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July 12, 2005 05:27:34

#1

xxx

RE: Find the probability of getting a number with 7 between 100 and 999 (both inclusive).

total number is 901/ number starting with 7 is 100/number ending with 7 is 90 number which has 7 in the middle is 90 280 so probability is 280/901

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July 13, 2005 01:31:30

#2

raghuram

RE: Find the probability of getting a number with 7 between 100 and 999 (both inclusive).

14/45

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July 13, 2005 01:33:37

#3

raghuram

RE: Find the probability of getting a number with 7 between 100 and 999 (both inclusive).

1/9 + 1/10 + 1/10 28/90

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July 13, 2005 01:34:04

#4

raghuram

RE: Find the probability of getting a number with 7 between 100 and 999 (both inclusive).

14/45

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August 19, 2005 03:28:59

#5

sarvesh kumar verma(IIITA)

RE: Find the probability of getting a number with 7 between 100 and 999 (both inclusive).

280 numbers r having 7 out of total 900 numbers
so probability is
280/900 14/45

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November 30, 2005 03:46:03

#6

vineet srivastava

RE: Find the probability of getting a number ...

total no from 100 to 999 inclusive of both are 900. Numbers starting with 7 are 100 numbers with 7 at end which does not contain 7 at the beginning is 80 and numbers with 7 in middle but with no 7 at start or end is 72 (we are excluding certain numbers coz they have already been counted)

hence probability is 252/900 (i.e. 7/25)

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July 21, 2006 15:28:55

#7

parv

RE: Find the probability of getting a number ...

its wrong cuz the no's are 900 n 280 r no's wid 7 so its280/900 or 28/90 wich can be easily done by 1/9+1/10+1/10

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