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A software engineer creates a LAN game where an 8 digit code made up of 1,2,3,4,5,6,
7,8 has to be decided on as a universal code. There is a condition that each number has to be
Used and no number can be repeated. What is the probability that first 4 digits of the code are even number?
a)1/70 b)1/840 c)1/8 d)1/40320
Read Solution (Total 8)
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- total no of ways is 8!.
for finding even nos at last 4 digit s ways are 4!
and that for odd is 4!
so it can be done in 4*3*2*1*4*3*2*1/8*7*6*5*4*3*2*1
ie 4!*4!/8! - 8 years agoHelpfull: Yes(20) No(0)
- so it can be done in 4*3*2*1*4*3*2*1/8*7*6*5*4*3*2*1
ie 4!*4!/8! - 8 years agoHelpfull: Yes(9) No(0)
- option:a is correct
- 8 years agoHelpfull: Yes(5) No(2)
- a) 1/70
8!/4!*(8-4)! - 7 years agoHelpfull: Yes(3) No(0)
- a)1/70
Total no of possible ways are 8!
The total number of possible ways to find even numbers at the last 4 digits are 4!
The total number of possible ways to find odd numbers at the last 4 digits are 4!
So, the probability that the first 4 digits of the code are even number = 4!*4!/8! = 1/70 - 6 years agoHelpfull: Yes(2) No(0)
- 4*3*2*1*4*3*2*1/8*7*6*5*4*3*2*1
ie 4!*4!/8!
so the answer will be (a)1/70 - 6 years agoHelpfull: Yes(1) No(0)
- 5,3,4,?,38
- 8 years agoHelpfull: Yes(0) No(2)
- (4! *4!)/8!= 1/70
- 5 years agoHelpfull: Yes(0) No(0)
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