Mathematics
Senior High

なぜこのようの式になるのですか!(2枚目)

255 次の値を求めよ。 ただし, nは0以上の整数とする。 (2) CA
(6) n+2Cn=n+2C(n+2)-n=n+2C2 (n+2)(n+1) _ (n+2)(n+1) 2.1 = 2

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