Add those Odds
Algebra
Level
3
What is the sum of all 3-digit odd positive integers?
The answer is 247500.
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1 solution
By finding the values for the formula s = (n÷2) [a+ l], where S is the sum, n is the number of 3 digit positive odd numbers, a is the first odd number, and l is the last, we can assign: a= 101, l= 999, and there are 450 positive odd 3 digit numbers, so by putting the values in the formula: (450÷2) (101+999)= 247500.