Question

Find the 29th term of the A.P. with the third term 20 and common difference is 9​

Answer 1

Answer:

3rd term is 20

so

a + 2d = 20

a + 2(9) = 20

a + 18 = 20

a = 20 - 18

a = 2

we want 29th term

a + 28d

2 + 28(9)

2 + 252

254

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