Mathematics
Senior High
なぜ項数nプラス１なんですか？
よってS= (n-1)2"+1
(4) S=1+2x+4x+... +2"x" とおくと
(口
S=1+2x+(2x)+...+(2x)"
であるからSは初
項1,公比 2x, 項数n+1の等比数列の和である
から
x = 1/12 のとき S=1-(2x)n+1
+
1-2x
II
X:
1/12 のときS=n+1
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