Question

An ap contains 43 terms the sun of 5 middle terms is equal to 195, find sum of the ap

Answer 1

Answer:1677

Step-by-step explanation:

First take the series as a,a+d,a+2d,.....,a+42d

Now sum of middle 5terms is 195

Those five terms are a+19d,a+20d,a+21d,a+22d,a+23d

Their sum is 5a+105d=195

a+21d=39

Now sum of all terms is 43a+(21)(43)d

43(a+21d)=43×39=1677