SOLUTION: what is the total or fromula to use when you want to add each number up to 150?

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Question 411328: what is the total or fromula to use when you want to add each number up to 150?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
add each number up to 150.
'If' it is whole numbers from 1 to 150 you wish to add:
S%5Bn%5D=%28n%2F2%29%282%2Aa%5B1%5D%2B+%28n-1%29d%29
S%5B150%5D=%28150%2F2%29%282%2A1%2B+%28149%29%2A1%29 = 75*151 = 11,325