Question

if a2=6 and a7=21 find a common difference by
d=ap-aq/p-q formula​

Answer 1

Answer:

a2=a+d=6. And

a7=a+6d=21

Let subtract,

a+6d=21

- a-d =-6(sign changes)

5d=15

Then,

d=15/5=3

Step-by-step explanation:

Hope it helps you