a+18d = 29
a+21d = 55
so, 3d = 26 and a = -127
S60 = 60/2 (2(-127)+59*26/3) = 7720
the 19th and 22nd term of an AP are 29 and 55 respectively Find the sum of it first sixty term
1 answer
1 answer
5 answers
2 answers
1 answer
3 answers