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10 cards from this deck
A triangle pattern with rows starting and ending in '1'.
It's the sum of the two numbers directly above it.
It expands powers of a binomial expression.
nCr = n! / (r!(n-r)!)
Start with '1', then add numbers from the 4th row.
Each row's sum equals 2^n.
Use row 3: 1, 3, 3, 1 for coefficients.
Result: 27 - 27x + 9x^2 - x^3.
They exhibit symmetry: nCr = nC(n-r).
Use the factorial formula for efficiency.
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