The Income Summary account is used to

The income summary account is a temporary account into which all income statement revenue and expense accounts are transferred at the end of an accounting period. The net amount transferred into the income summary account equals the net profit or net loss that the business incurred during the period.

Step-by-step explanation:

(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