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3 April, 15:39

What is the sum of the first 51 terms of the sequence?

-282,-266,-250,-234, ...

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  1. 3 April, 17:50
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    A1 = - 282d = 16 n = 51

    S = n/2 (2a1 + (n-1) d)

    = 51/2[2 (-282) + 50 (16) ] = 51[-282 + 25 (16) ] = 51 (400 - 282) = 51 (118) = 6018
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