Question

Write the sum using summation notation, assuming the suggested pattern continues.1 - 3 + 9 - 27 + ...

Answer 1

the pattern is \((-1)^n3^n\)

Answer 2

\[\sum_{n=0}^{\infty}1*3^n\]
\[\sum_{n=0}^{\infty} 1*3^(n+1)\]
\[\sum_{n=0}^{\infty} 1(-3)^n \]
\[\sum_{n=0}^{\infty} 1(-3)^(n+1)\]

Answer 3

Not quite.

Answer 4

More like
\[\sum (-1)^n3^n \]

Answer 5

what about this one?
Write the sum using summation notation, assuming the suggested pattern continues.

100 + 121 + 144 + 169 + ... + n2 + ...