Hi so I am trying to find the coefficient (x)^(12) in $(1-x^5)^3$·(1-x)^(-3)
I know this becomes $(1-3x^5$+3x^(10))·$(1+3C1x+4C2x^2+....)$
Then =14C2-3·8C6+3·1
I am abit confursed where the8C6 and 3·1 come from.
Thanks in advance,
Jordan
2026-04-03 04:17:22.1775189842
Finding the coefficient x^12 of a generating function
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