Question

Find the sum of a finite arithmetic sequence from n = 1 to n = 15, using the expression 2n + 5.

Answer 1

@dayakar

Answer 2

@mathmale

Answer 3

@mathmale

Answer 4

Hello! What formula have you been using to find the sum of an arith seq?

Answer 5

(n/2)(a1 + an)?

Answer 6

See: Summing an Arithmetic Series

in: https://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html

Answer 7

Please use this reference to judge whether your formula is correct or not.

Answer 8

yes it is

Answer 9

i have to go pick up my siblings , ill be back