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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