Question

what expression defines the arithmetic series 4+8+12...

Answer 1

an = dn + c

Where d is the common difference between consecutive terms of the sequence, and c = a1 - d.

Answer 2

in sigma form

Answer 3

oh you want a summation

Answer 4

yes

Answer 5

does the series end at a number or does it go on infinitely?

Answer 6

it ends at the fourth number but it doesnt give that number

Answer 7

so it would be 4,8,12,a4, correct?

Answer 8

yes

Answer 9

\[\sum_{n=1}^{4} 4n\]

Answer 10

just to make sure you understand, do you understand sigma notation?

Answer 11

The n=1 means that the summation starts with the first term and ends with the term at the top (4), the equation used to represent the series would go to the right of that

Answer 12

thankyou :)