Infinite series

1003108703

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

1003108702

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

1003108701

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

9000073401

Level: 
B
In the following list identify the expression which equals \(3.3\overline{12}\).
\(3.3 +\sum _{ n=1}^{\infty }12\cdot 10^{-2n-1}\)
\(3 +\sum _{ n=1}^{\infty }312\cdot 10^{-2n-1}\)
\(3 +\sum _{ n=1}^{\infty }312\cdot 10^{-3n}\)
\(3.3 +\sum _{ n=1}^{\infty }12\cdot 10^{-3n}\)

9000073402

Level: 
B
In the following list identify the expression which equals \(- 1.0\overline{345}\).
\(- 1 -\sum _{n=1}^{\infty }345\cdot 10^{-3n-1}\)
\(- 1 -\sum _{n=1}^{\infty }345\cdot 10^{-3n}\)
\(-\sum _{n=1}^{\infty }(10 + 345\cdot 10^{-3n-1})\)
\(1 -\sum _{n=1}^{\infty }345\cdot 10^{-3n}\)