What is the unit's digit of the number 6^{256}–4^{256}

0

1

4

7

Correct Answer : A

N is the smallest number that has 5 factors. How many factors does (N - 1) have??

If x is a number satisfying 2 < x < 3 and y is such that 7 < y < 8, which of the following expressions will have the largest value?

Given that a and b are integers. then ab(a2 − b2)(a2 + b2) is divisible by