Question 162825: what is the sum of the first 307 even numbers? There is know textbook.
Answer by orca(409)   (Show Source):
You can put this solution on YOUR website! The numbers are 2, 4, 6, ......614.
It can be written as:
2x1, 2x2, 2x3, 2x4, ..........2x306, 2x307
So
2x1, 2x2, 2x3, 2x4, ..........2x306, 2x307
= 2(1 + 2 + 3 + 4 +........+306 + 307)
= 2x307x308/2 (Note that 1 + 2 + 3 + .... + n = n(n+1)/2)
= 307x308
= 94556
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