Mathematics
Senior High
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このnたちはどこへ消えたのですか?
(2) Co-nC1+nC2-nC3+..+(-1)"nCn=0
を証明せよ。
(2) (a+b)"=nCoa®+nC₁a²²-y
+nCzan-262+..+nCmb"
の両辺に α=1, 6 = -1 を代入すると
(1−1)"=" Co-nC1+nC2+..+(-1) "" C
..nCo-nC1+nC2+..+(-1)*nCn=0
となる.
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なるほどです!ありがとうございます!