Question

Find the sum of 10 terms of an AP 50,46,42...

Answer 1

Answer:

answer of this Q. is 320

Step-by-step explanation:

Sn=n/2{2a+(n-1)d}

S10=10/2{2×50+(10-1)×-4}

=5(100+9×-4)

=5(100-36)

=5×64

=320