WHICH ONE OF THESE NUMBERS IS AN INTEGER?
A:
12.5
B
1/3
C:
0.75
D
2

D) 2

Step-by-step explanation:

An integer is any whole number negative or positive. 1/3 is not an integer because it is a fraction, not a whole number. 12.5 and 0.75 are not integers because they are decimals, not whole numbers. 2 is an integer because it is a full number.

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18