SOLUTION: Sum of Consecutive Natural Numbers Find the sum 1 + 2 + 3 + 4 + 5 + . . . + 361.

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Question 905446: Sum of Consecutive Natural Numbers
Find the sum 1 + 2 + 3 + 4 + 5 + . . . + 361.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad
1 + (n-1)1 = 361, n = 361
S%5Bn%5D=%28n%28a%5B1%5D%2Ba%5Bn%5D%29%29%2F2
S%5B361%5D=%28361%281+%2B+361%29%29%2F2+=+361%28362%29%2F2+=+361%2A181