Math, asked by GaneshNC, 1 year ago

In the first term of an AP is 3, the sum of first 5 terms is 1/11th of the sum of next 5 terms .find the 20th term​

Answers

Answered by trishagupta
5
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Answered by idris43
2
a=3 & S5=1/11 (S10-S5)

12S5=S10

30(2a+11d)=5 (2a+9d)

6 (2a+11d)= 2a+9d

10a=-57d

a=3

30=-57d

d=-10/17

a20=3-10/17

=(57-10)/17

=47/17
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