MBA Exam

what is the tens digit of 2^2001 ?

1) 5
2) 2
3) 4
4) 8

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MBA Other Question

If S be a set of all 2 digit numbers which can be expressed as the product of 2 distinct primes then how many numbers in S will have exactly 14 coprimes less than the number

1) 0
2) 1
3) 2
4) 3
when 10^10 is divided by 81, the quotient is

1) 123456788
2) 123456789
3) 123456790
4) 123456791