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Question

Which term of the A. P. 1 + 4 + 7 + 10 + ............. is 52 ?


Solution

common difference=D=3
as we know

52 = a + (n - 1) 3

52 = 1 + (n - 1) 3

51/3 = n - 1

17 + 1 = n

n = 18

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