$2 + 2^{2} + 2^{3} + 2^{4} + 2^{5} + 2^{6}$ =___

$2^{6} - 2$

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$2^{7} - 2$

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$2^{6} - 1$

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$2^{7} - 1$

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Solution

The correct option is B
$2^{7} - 2$

In general, the sum of the powers $2, 2^{2}, 2^{3}$ and so on, is equal to 2 subtracted from the next power to the last

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