Question

find he series shown
∑n=3∞(2n+5)
these r the choices:


7 + 9 + 11 + 13 + 15

11 + 13 + 15 + 17 + 19

11 + 13 + 15 + 17 + ...

7 + 9 + 11 + 13 + ...

Answer 1

So n starts at 3.
If you set n=3 in the formula 2n+5, you get the first term.
If you set n=4 in the formule 2n+5, you get the second term.
(go on forever, increasing n and calculating 2n+5)

As soon as you have done this, you will know the right answer!

Answer 2

Have a closer look at the options: some have 5 terms, some go on forever...

Answer 3

thanks i got the last

Answer 4

7.9.11.13

Answer 5

@wildfire95 if you plug 3 in 2n+5 you don't get 7 as first term, check again !