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10 cards from this deck
Rows start & end with 1; each other number is sum of two numbers above it
With 1
Sum of two numbers directly above
Find coefficients in binomial expansion
Coefficients in (a+b)n(a+b)^n(a+b)n expansion
Writing expressions without full multiplication
(nr)xn−ryr\binom{n}{r}x^{n-r}y^r(rn)xn−ryr
Powers in each term must add to nnn
2 (since 5+2=75+2=75+2=7)
r=5r=5r=5 (starts at 0)
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