Please answer this ASAP!
I'll mark the best as BRAINLIEST
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Answer:
12
n(9n
3
+64n
2
+15n−34)
General term : (1+k)(2+k)(1+3k) where k=1 to n
∑
k=1
n
(1+k)(2+k)(1+3k)=∑
k=1
n
3k
3
+10k
2
+9k+2
=3
4
n
2
(n+1)
2
+10
6
(n)(n+1)(2n+1)
+9
2
(n)(n+1)
+2n
=
12
n(9n
3
+64n
2
+15n−34)
W
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