The sum of first 4 term of GP with $a = 2, r = 3$ is

80

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26

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127

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8

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Solution

The correct option is A $80$
Given, $a = 2, r = 3$
Sum of first $n$ terms is
$\frac{a (r^{n} - 1)}{r - 1}$
$∴ S_{4} = \frac{2 (3^{4} - 1)}{2} = 81 - 1 = 80$

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