Question

Which term of the AP 6 12,18,24 .... is 90​

Answer 1

Answer:

90 is the 15 term of this AP.

Step-by-step explanation:

given AP is  6 12,18,24 ...

=> first term, a = 6 ; common difference, d =  t₂ - t₁ = 12-6 = 6

given the last term = 90 that is the n'th term

we know, n = [ (l-a)/d ] + 1

=> n = [ (90-6)/6] + 1

=> n = [84/6] + 1

=> n = 14 + 1

=> n = 15

so, 90 is the 15 term of this AP.