MBA Exam

Let A ={ x where x is a prime no.and x < 30}.the no.of differnt rational numbers numerator and denominator belong to A is

1) 90
2) 180
3) 91
4) none of these,.

plz explain...........

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MBA Other Question

Find d remainder when 50^51^52 is divided by 11.explain also.....

1) 6
2) 4
3) 7
4) 3
what power of 45 will exaclty divide 123!?what exact power of 5 divides 87!?in dis case as 5 is prime number..i knw d solutionbut when d number is not prime..wat to do?ex. what power of 45 will exactly divide 123!?

1) 28
2) 30
3) 31
4) 59