200*50=10000
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1166650
40000
The sum of all odd numbers 1 to 120,000 is 14,400,000,000.
This is the way I would do it: The sum of the 1st & 100th numbers = the sum of the 2nd & 99th numbers = the sum of the 3rd & 98th numbers all the way to the sum of the 50th & 51st numbers; each of the sums equals 200. So I would multiply 200 by 50 (10000).
The sum of all odd numbers from 1 to 64 inclusive is 4,096