Question

The common difference of an ap whose first term is 5 and the sum of the first part of an ap is equal to half the sum of the next from terms

Answer 1

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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