Question

the 8th term of an AP is 60 and its 15 term is 109 find common difference

Answer 1

Answer:

Step-by-step explanation:

here, given a₈=60 and a₁₅=109 and we have to find d=?

⇒a+7d=60 ...(i)

⇒a+14d=109...(ii)

on solving eqn, (i) & (ii) we get,

a=11 so put it in eqn. (i)

we get d =7

hence, common difference=7.

Answer 2

Answer:

d=7

Step-by-step explanation:

we know that tₙ = a+(n-1)d

a₈ = 60, a₁₅ = 109

a₁₅ - a₈ = (a+14d) - (a-7d)

109-60 = 7d

49 = 7d

d = 7