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12 cards from this deck
Expand (a+b)n(a + b)^n(a+b)n where nnn is a positive integer
n+1n + 1n+1 terms
ParbsPa^r b^sParbs where PPP is coefficient
r+s=nr + s = nr+s=n for every term
Coefficients for binomial expansions
Each number = sum of two numbers directly above it
Always 1
1, 2, 1
1, 3, 3, 1
1, 4, 6, 4, 1
Check sum of powers in each term equals nnn
Be careful with alternating positive and negative signs
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