Math, asked by Twinkle7582, 1 year ago

If an ap the sum of first ten terms is 4 times the sum of first five terms then the ratio of first term and common difference is

Answers

Answered by Anonymous

2

10/2(2a+(10-1)d)=4(5/2(2a+(5-1)d))

5(2a+9d)=10(2a+4d)

2a+9d=2(2a+9d)

2a+9d=4a+18d

-2a=9d

a/d=-9/2

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