Sum of numbers to million
Number Theory
Level
2
What is the answer of: 1 + 2 + 3 + 4 + 5 + 6 + 7.............................................. + 999997 + 999998 + 999999 + 1000000
There is a simple way to do this!
The answer is 500000500000.
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1 solution
You can use the formula S = (n(n+1))/2
In this case, n = 1,000,000
So:
(1,000,000(1,000,000 + 1))/2
Simplify:
(1,000,000(1,000,001))/2
= 1,000,001,000,000/2
= 500,000,500,000