Question

In an AP the sum of first 11 terms is 44 and the sum of next 11 terms is 55. Find the first term and the common difference.

Answer 1

39/11=a

first term is 39/11

difference is 10/11

check

44 = ½(2a + d(10))11

44=1/2(2*39/11+10/11)*11

ok