Question

Write the series in summation notation: -3 + 6 - 9 + 12 - 15

Answer 1

Any ideas?

Answer 2

no

Answer 3

\[\sum_{n=1}^{\infty} 3n (-1)^{n}\]

Answer 4

what about 1+1/4+1/9+1/16+1/25

Answer 5

that series in summation notation

Answer 6

\[\sum_{n=1}^{\infty}\frac{ 1 }{ n ^{2} }\]

Answer 7

thx:)

Answer 8

pleasure