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Find the sum of the first 11 positive numbers which are multiples of 6.

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Find the sum of the first 11 positive numbers which are multiples of 6.

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The positive multiples of 6 are 6, 12, 18, …

This sequence is an A.P. with

a = 6, d = 12 –6 = 6

\(\therefore\) The sum of the first 11 positive multiples of 6 is 396.

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