Question

5 + 11 + 17 + ........ Get the sum of the first 20 terms of the parallel series.​

Answer 1

Answer: the sum of the given AP would be 1240

expalination

a=5

n=20

d=6

s=?

now applying the formula we get :-

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

 = 20/2 [2*5+ (20-1)6]

 = 10 [10+19*6]

= 10[10+114]

 =  10*124

s=1240

i hope it helps you

thankyou