SOLUTION: if you get a penny on day one, then on day two you get 2 pennies, day three you get 3 pennies and so on - Write an expression showing how many you will have on day "n"

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Question 798918: if you get a penny on day one, then on day two you get 2 pennies, day three you get 3 pennies and so on - Write an expression showing how many you will have on day "n"
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
This is 1 + 2 + 3 + 4 + 5 + 6 . . .
The formula ( which I happen to know ) is
Sum = +%28+n%2A%28+n+%2B+1+%29%29+%2F+2+
If +n+=+6+, the sum is +21+
Sum = +%28+6%2A7+%29+%2F+2+=+21+