If $1 - 6 + 36 - 216 + . . . . .$ is a geometric series, then find $r$ .

1

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- 6

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36

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- 216

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Solution

The correct option is B $- 6$
Given series is $1 - 6 + 36 - 216 + . . . .$
Common ratio $=$ $\frac{second number}{first number}$
$=$ $\frac{- 6}{1} = - 6$
So, the common ratio, $r$ is $- 6$ .

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