2ab5 is a four-digit number divisible by 25. If the number formed from the two digits ab is a multiple of 13, then ab =

10

25

52

65

Correct Answer : C

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