Infinite series

1003108701

Level: 
A
Use summation notation to express the given infinite series. \[1+\frac12+\frac14+\frac18+\dots \]
\( \sum\limits_{n=1}^{\infty} \frac1{2^{n-1}} \)
\( \sum\limits_{n=1}^{\infty} \frac1{2^{n}} \)
\( \sum\limits_{n=1}^{\infty} \frac1{2^{n+1}} \)
\( \sum\limits_{n=1}^{\infty} \frac1{2^{2n}} \)
\( \sum\limits_{n=1}^{\infty} \frac1{2^{2n-1}} \)

1003108702

Level: 
A
Use summation notation to express the given infinite series. \[ -1+2-4+8-16+\dots \]
\( \sum\limits_{n=1}^{\infty} (-1)^n\cdot2^{n-1} \)
\( \sum\limits_{n=1}^{\infty} (-1)^{n-1}\cdot2^{n-1} \)
\( \sum\limits_{n=1}^{\infty} (-1)^{n+1}\cdot2^{n-1} \)
\( \sum\limits_{n=1}^{\infty} (-1)^n\cdot2^{n+1} \)
\( \sum\limits_{n=1}^{\infty} (-1)^n\cdot2^{n} \)

1003108703

Level: 
A
Use summation notation to express the given infinite series. \[ \frac3{x^3}+\frac3{x^2}+\frac3x+3+3x+\dots \]
\( \sum\limits_{n=1}^{\infty}3\cdot x^{n-4} \)
\( \sum\limits_{n=1}^{\infty}3\cdot x^{n-3} \)
\( \sum\limits_{n=1}^{\infty}3\cdot x^{n+3} \)
\( \sum\limits_{n=1}^{\infty}3\cdot x^{n+4} \)
\( \sum\limits_{n=1}^{\infty}3\cdot x^{n} \)