Given nl = 28, S = 144, and there are total 9 terms. Find a:

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asked Mar 14, 2018 in Mathematics by paayal (26,720 points) 4 6 11

Given nl = 28, S = 144, and there are total 9 terms. Find a:

1 Answer

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answered Mar 14, 2018 by sanjaydas (61,430 points) 5 7 7
selected Mar 15, 2018 by faiz
 
Best answer

Solution: Sl = 144 =9/2(a + 28)

➪ 144 x 2/9 = 32 =a + 28

➪a = 32 -28 = 4

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