The sum of first 11 multiples of 12 is

780

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792

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804

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816

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Solution

The correct option is B 792
$S_{n} = \frac{n}{2} [2 a + (n - 1) d] S_{11} = \frac{11}{2} (2 (12) + 10 (12)) S_{11} = 792$

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