MBA Exam

A tries to hit a target.P(A hitting target) = 0.1.P(exactly 1 hit in 5 shots) =?

1) 0.1*(0.9)^4
2) 0.5*(0.9)^4
3) 0.9*(0.1)^4
4) NONE

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MBA Other Question
If a,b,c,d are natural no.s such that a^d + b^d = c^d, which of the following is true

1) minimum of a,b,c is atleast d
2) max of a,b,c is atmost d
3) min{a,b,c}<d<max{a,b,c}
4) d=1
 Can anyone explain the question below:suppose a no. which has 2 at its right end, if 2 is shifted to the left end then the no. obtained is 2 times the earlier number. what is the earlier number?