MBA Exam

The digits of a four digit number form an arithmetic progression, not necessarily in the same order. How many such four digit numbers are possible if the arithmetic mean of all the digits is an integer?

1) 72
2) 84
3) 90
4) 96

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MBA Other Question

what is the probability that a rectangle selected at random from a 8*8 chess board is a square?

1) 0
2) 17/108
3) 64/1296
4) 1
(a,b)is an ordered pair such that a, b are two two digit numbers. when a interchange it's digit becomes b. How many ordered pair are there such that (a-b) is a perfect square except zero ?

1) 3
2) 10
3) 13
4) none of these