Question

Find the sum of an ap is 7,10,13...... 15term

Answer 1

Answer:

56

Step-by-step explanation:

sum of terms in ap=2a+(n-1)d

nth term=a+(n-1)d

given, a=7

n=15, d=3

sum of terms in ap=2(7)+(15-1)(3)

=14+14(3)

=14+42

=56

Answer 2

Answer:

sn=n/2(2a+(n-1)d

Step-by-step explanation:

S15=15/2(2*7(15-1)3);15/2(14(14*3); 15/2(14*42):15/2+588);15*294;=4410;15 term is 4410