Sum of first n natural numbers is (n) x (n + 1)/2
Here we have the sum = 100 x (101)/2 = 50 x 101 = 5050
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The sum of the whole numbers from 1 to 100 inclusive is 5,050.
The sum of all the odd numbers from 1 through 100 is 10,000
n*(n+1)=sum 100*(100+1)=10100
The sum of the numbers 1 to 100 is 5050.
The sum of the first 100 odd numbers (1 through 199) is 10000 (ten thou)