Question

Find the sum of the arithmetic series:
6 + 10 + 14 + ... + 86

Answer 1

plus 4 each time

Answer 2

The answer should be 996

Answer 3

same type as last one.... did u try first ?

Answer 4

a=6,l=86
find n by
l=a+(n-1)d
then Sn=n(a+l)/2

Answer 5

so 21=n?

Answer 6

yea,correct

Answer 7

so then what

Answer 8

Sn=21(6+86)/2

Answer 9

966???

Answer 10

correct

Answer 11

yeah 966 is correct, now can you solve similar type of questions on your own ?

Answer 12

I think so...