MBA Exam

From a pool set of 16 balls, some balls were selected.In case where order matters, balls were selected in 3360 ways.And in case , where order doesn't matter, balls were selected in 560 ways..How many balls were selected.??

1) 6
2) 8
3) 4
4) 3

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MBA Other Question

How many factors of N=1020 will be divisible by 5 but not by 15?

1) 6
2) 3
3) 12
4) 0
5) 2
Find the remainder when 2^90 is divided by 91.(approach plzzz..)

1) 90
2) 1
3) 64
4) 27
5) 45