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13 October, 14:43

What is the sum of the first 14 terms of the sequence

an = 6n - 12

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  1. 13 October, 15:44
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    Term 1 = 6*1 - 12

    Term 1 = 6 - 12

    Term 1 = - 6

    Term 14 = 6*14 - 12

    Term 14 = 84 - 12

    Term 14 = 72

    Number of terms = 14

    Sum = (term1 + Term14) * number of terms / 2

    Sum = (-6 + 72) * 14/2

    Sum = 66*14/2

    Sum = 462
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