MCQOPTIONS
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MCQOPTIONS
| 1. |
The sum of the first n terms in the sequence 8, 88, 888, 8888, ….. is _____. |
| A. | \(\frac{{81}}{{80}}\left( {{{10}^n} - 1} \right) + \frac{9}{8}n\) |
| B. | \(\frac{{81}}{{80}}\left( {{{10}^n} - 1} \right) - \frac{9}{8}n\) |
| C. | \(\frac{{80}}{{81}}\left( {{{10}^n} - 1} \right) + \frac{8}{9}n\) |
| D. | \(\frac{{80}}{{81}}\left( {{{10}^n} - 1} \right) - \frac{8}{9}n\) |
| Answer» E. | |