Question

Find the sum of the first term of the ap 12,14,16,18,20

Answer 1

Answer:

Here a=12,d=4,n=5

.

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

=5/2[2×12+(5-1)×5]

=5/2[24+4×5]

=5/2[24+20]

=5/2×44

=5×22

=110