Question

The sum of first 5 terms of an arithmetic sequence is 35 and the sum of the first 9 terms is 99.b)What is its common difference? *​

Answer 1

Step-by-step explanation:

a+4d=35(i)

a+8d=99(ii)

After subtracting(ii)from(i)

we get,

-4d=-64

d=-64/-4

d=16