Question

Find the sum of the arithmetic sequence.

-4, -1, 2, 5, 8, 11, 14

Answer 1

hey it is simple..
we know that sum is given by
=n/2*(2a+(n-1)*d)
here
n=7, a=-4 and d=3
putting this together we get
sum=7/2*(2*-4+(7-1)*3)
=35

Answer 2

@irshadno1 thank you