Question

find the common difference of an A.P . whose first term is 5 and the sum of first four term is half the sum of the next four term.​

Answer 1

Answer:

Let d is common difference of AP

Now first 4term is 5,5+d,5+2d,5+3d

and next 4term 5+4d,5+5d,5+6d,5+7d

Now according to question

20+6d=(20+22d)/2

20+6d=10+11d

d=2

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