Question

Which term of the A. P. 1, 4, 7..... is 55 ?​

Answer 1

Given A.P is

1,4,7

therefore

d=3 a=1

tn=55

using the formula

tn=a+(n-1)×d

55=1+(n-1)×3

55-1=(n-1)×3

54=(n-1)×3

54/3=(n-1)

18=(n-1)

n-1=18

n=19

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