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Find an ap whose first term …

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Find an ap whose first term is 1 and the sum of first four terms of one third of the sum of next four terms .

Posted by Adi Chauhan 7 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Shweta Gulati 7 years, 1 month ago

a=1

S₄= {tex}{1\over 3}{/tex}[S₈-S₄]

4\2 [ 2+3d] = 1\3 [2+7d-2-3d]

2 (2+3d) = 1/3 (4d)

6(2+3d) = 4d

12 +18d = 4d

12 = -14d

-6/7 =d

So, A.P. becomes 1,1/7,-5/7....

0Thank You

ANSWER

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CBSE > Class 10 > Mathematics