Question

find the indicated term in each of the following sequence whose nth term are an=n(n+1)(2n+1)/6;a10​

Answer 1

3)To find the eighth term of sequence (a8) put n=8 in equal (1)

⟹a8=(−1)8×8

⟹a8=1×8

⟹a8=8

Answer 2

Answer:

first answer is absolutely wrong