MBA Exam

If the harmonic mean between two positive numbers is to their geometric mean as 12 : 13; then the numbers could be inthe ratio :please explain the solution whoever gets it correct..

1) 12 : 13
2) 1/12:1/13
3) 4:9
4) 2:3

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MBA Other Question
Out of 20 consecutive natural numbers, in how many ways can 4 numbers be selected, such that any two among the selected numbers differ by at least 3?

1) 20C3/3
2) 17C4
3) 23C4
4) 14C4
 V is a 56 digit number. All the digits except the 32nd from the right are the same. If V is divisible by 13, then which of the following can never be the unit’s digit of V?

1) 4
2) 7
3) 1
4) Both 4 and 7