Question

Sum of the Arithmetic Series 15+25+35+......+105 is​

Answer 1

Answer:

hope this helps

Step-by-step explanation:

600

Answer 2

Step-by-step explanation:

common difference =25-15=10

sequence=15, 25, 35, 45,

(Xn-1)d=105-15

(Xn-1)10=90

Xn-1=90/10

Xn-1=9

Xn=9+1=10

They are 10 terms here.

sum=no.of pairsx(sum of first and last)

=5x(15+105)

=5x120

=600

Hope this answer will help you.