Counting & ProbabilityEasyBinomial Theorem, Pascal & Combinatorial Identities ShareBinomial Theorem, Pascal & Combinatorial Identities · Easy problemRewrite 2(72)2\binom{7}{2}2(27) in the form n(n−1k−1)n\binom{n-1}{k-1}n(k−1n−1) and evaluate it.Check Show answer Walk through it step by step Practice more like this Review this concept