Question

find the sum of the 1st 10 terms of the ap 1,5,9,13​

Answer 1

Answer:

190

Step-by-step explanation:

1,5,9,13,............

a=1

d=4

n=10

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

S10=10÷2(2+(10-1)4)

S10=5×38

=190