11. If 2r +
4
4 = ܐ
4, then 4r2 +
is
Answers
Answered by
0
Answer:
2r+4--6
Step-by-step explanation:
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Answered by
0
Step-by-step explanation:
Given
r=1
∑
n
r
4
=f(n).
Now,
r=1
∑
n
(2r−1)
4
=
r=1
∑
2n
r
4
−
r=1
∑
n
(2r)
4
.......(.writing as sum of 2n terms−sum of all even terms)
⇒
r=1
∑
n
(2r−1)
4
=f(2n)−16
r=1
∑
n
r
4
⇒
r=1
∑
n
(2r−1)
4
=f(2n)−16f(
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