3/8 + 1/4 + 2/3 + 1/2 =

1 19/24

Step-by-step explanation:

3/8 + 1/4 + 2/3 + 1/2

The common denominator is 24

3/8 *3/3 + 1/4 *6/6 + 2/3 *8/8   + 1/2 *12/12

9/24 + 6/24 + 16/24 + 12/24

43/24

Changing to a mixed number

24/24 +19/24

1 19/24

(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

step-by-step explanation: yes