allymays25 allymays25
  • 28-02-2017
  • Mathematics
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What is the sum of the first 11 terms of the arithmetic series in which a1 = –12 and d = 5?

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WalkingDisaster408
WalkingDisaster408 WalkingDisaster408
  • 28-02-2017
use the formula Sum= n/2(2a + (n-1)xd)
So, 11/2(2x-12 + (11-1)x5)
       =57.2

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