Question

There is an AP 1, 3, 5…. Which term of this AP is 55?

Answer 1

28th term will be 55

2n-1 = 55

2n = 55+1

2n = 56

n = 56/2

n = 28

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Answer 2

Answer:

1, 3, 5….

a=1

d=2

n=?

let 55 be the n th term-

(a)n= a+(n-1)d

55= 1+(n-1)2

54= 2n-2

2n= 56

n=28.

∴The 28 th term is 55.

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