Question

If 12th term of an AP is -19 and sum of first 4 terms is 44 , what is the sum of first ten terms .

Answer 1

a+11d=-19
a+a+d+a+2d+a+3d=44
4a+6d=44
....2a+3d=22
solve these 2eqn...
find a and d and put below
s=(10/2)(2(a)+9d)

Answer 2

10
$10 \div 2 = 5$