Question

If 12th term of an A.P. is -13 and the sum of the first four term is 24, what is the sun of first 10 terms?

Answer 1

Answer:

0

Step-by-step explanation:

12th term of an A.P. is a+11d

a+11d=13

Sum of first four terms is 24

a+a+d+a+2d+a+3d=24

4a+6d=24

after solving both the eq the value of d=-2 and a=9

Sum of first ten terms:

S10 =10/2(2*9+(9-1)(-2))

S10=5(18-18)

=5*0

S10=0

the ans is 0