C(n,k) is the binomial coefficient also written nCk or (n on top of k). The general form for (a+b)^n is sum k=0 to 6 of C(n,k) a^(n-k) b^k Note that C(n,k)=C(n-k). This also gets used for binomial probabilities with different indexing but equivalent results.
The exponents add to 6 (n). C(n,k) is a palindrome: A sequence that reads the same backwards as forwards.
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