a=1; b=1
(a + b)^5 = a^5 + 5·a^4·b + 10·a^3·b^2 + 10·a^2·b^3 + 5·a·b^4 + b^5
COMB(5, 0) = 1; COMB(5, 1) = 5; COMB(5, 2) = 10;
COMB(5, 3) = 10;COMB(5, 4) = 5; COMB(5, 5) = 1
1 + 5 + 10 + 10 + 5 + 1 = 32 = 2^5
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