Choose the correct answer from the alternatives given :
Given 1 + 2 + 3 4 + + 10 = 55 then the sum 6 + 12 + 18 + 24 + + 60 is equal to

300

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655

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330

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455

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Solution

The correct option is C 330
$1 + 2 + 3 + 4 + . . + 10 = 55 (g i v e n)$
$6 + 12 + 18 + + 60 = ?$
$6 (1 + 2 + 3 + 4 + + 10)$
$6 \times 55$ = $330$

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