A set has exactly five consecutive positive integers starting with 1. What is the percentage decrease in the average of the numbers when the greatest one of the numbers is removed from the set?

8.5

12.5

15.2

16.66

Correct Answer : D

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

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?