Question

- The 10th term of AP is 31and 20th term of AP is 71. Find the 30th term​

Answer 1

Answer:

when 10th term of AP is 31 and

20th term of AP is 71

20th term - 10th term =?

71-31=40

30th term of AP is 71+40=111

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Answer 2

Step-by-step explanation:

9d+a=31 ......(i)

19d+a=71....(ii)

(ii)-(i)

10d=40

d=4

a=3

30th term=120