17
#
n(n+12+
6
(n+1) 2n+1)
6
F E(+) - [EXx)]
(P + 1)(2 + 1) +
6
2
(n+1) (2n+1) (n+1²+ 2n)
4.
(n+1) (2n + 1) ( + 2 + 1)
[: E(2)
6
4
_
3 (
2(+1) 2 + 1) - 3² + 2 + 1)
12
Answers
Answered by
1
Answer:
17
#
n(n+12+
6
(n+1) 2n+1)
6
F E(+) - [EXx)]
(P + 1)(2 + 1) +
6
2
(n+1) (2n+1) (n+1²+ 2n)
4.
(n+1) (2n + 1) ( + 2 + 1)
[: E(2)
6
4
_
3 (
2(+1) 2 + 1) - 3² + 2 + 1)
12
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