Question

A locker combination has three nonzero digits, and digits cannot be repeated. If the first two digits are even, what is the probability that the third digit is even?

Answer 1

no.s can be 2,4,6,8
r=4
4p1=4!/(4-1)!
4p1=4
total no=9
probability=4/9

Answer 2

The locker combination has three nonzero numbers so the last digit cant be zero but all other even numbers in between 1 to 9
Between 1 to 9 we have
2,4,6,8 these r the even numbers
total numbers between 1 to 9 is 9 so the probability of getting 1 even number is
`(4)/(9)` ...