SOLUTION: how do I find the sum of consecutive integers from 17 to 97? what is the formula for it? how to find the sum of consecutive odd integers from 17 to 97?

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Question 903581: how do I find the sum of consecutive integers from 17 to 97? what is the formula for it?
how to find the sum of consecutive odd integers from 17 to 97?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
an = a + (n - 1)d
solve for n
97 = 17 + (n - 1)1
n=81
97 = 17 + (n - 1)21
n=41 odd
plug in n below
S = ½(a + an)n
S = ½(17 + 97)81=4617
S = ½(17 + 97)41=2331