Math, asked by neelesh2130, 2 months ago

find the sum of first 20 term of the A.P. 7,11,15,19,...

Answers

Answered by ranjeetasanjupc9x22

0

Step-by-step explanation:

AP. 7,11,15,19,...

a=7 , d= 11-7 = 4

S20= 20/2[ 2(7)+(20-1)4]

= 10[ 14+19(4)]

=10[14+76]

= 10 x 90

= 900

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