900
The sum of two whole numbers is odd when one but not both of them is odd.
The sum of the first 8,000 odd numbers 64,000,000.
The sum of the first 600 odd numbers is 360,000.
The sum of the first nine odd numbers is 81.
The sum of the first 10 odd whole numbers is 100.
The sum is 10,000.
The sum of the first 5,000 odd numbers 25,000,000.
16
900
The sum of two whole numbers is odd when one but not both of them is odd.
The sum of the first 15 odd numbers is 225.
The sum of the first 300 odd numbers is 90,000
The sum of the first 40 odd numbers is 1,600.
The sum of the first 8,000 odd numbers 64,000,000.
The sum of the first 600 odd numbers is 360,000.
The sum of the first nine odd numbers is 81.