Mathematics
Senior High
Resolved
このふたつって同じですか？
=4"-1
等比数列の和であるか
1-a")_1-a"
TANK
-a
=n
1-a
あるから,第6項は
)a:1,ト=a
Sn = ((an-1)
a
a-1
a-4
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そうですよね！！
ありがとうございます！！