Question

Given the sequence 9, 12, 15, which of the following is equivalent to

Answer 1

\[\sum_{n=5}^{8}an\]

Answer 2

15

Answer 3

if a=3

Answer 4

Actually what do u want ?

Answer 5

I can't get:/

Answer 6

@ash2326 @AravindG Plz help:)

Answer 7

I know this much: -
\[\sum_{n=0}^{\infty}(9+3n)\]

Answer 8

It is ur sequence.

Answer 9

i dont understand what the question is asking for, im as lost as you. haha

Answer 10

i meen i got that, but i dont know what to do with it

Answer 11

oh i seeee loll

Answer 12

So what did u not get?

Answer 13

do you want the sum of the 5th to 8th terms inclusive?

Answer 14

when n = 5 term - 9 +3(5) = 24