Physics
Undergraduate
この問題の、(2)を教えていただきたいです。
213 次の数列の第k項を求めよ。 また, 初項から第n項までの和を求めよ。
AR= AT (KY)
(1)
*(2)
m=1\1=1\k=1
=))
12+1・2+22, 22+2・3 +32,32+ 3・4 +42,
12+2+5+72,
12, 12+32,12+3+52,
...
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