What is the legal term for redundant?

1. Exceeding what is necessary or natural; superfluous.

2. Needlessly wordy or repetitive in expression: a student paper filled with redundant phrases.

3. Of or relating to linguistic redundancy.

4. Chiefly British Dismissed or laid off from work, as for being no longer needed.

Found at thefreedictionary.com

(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