The question can also be written as: 2 + 4 + 6… + 200 This is a series. The formula to solve a series such as the above is n(n+2)/4, where n represents the last number in the series, in this case 200. read more
The sum of the first 100 even numbers is 10,100. This is calculated by taking the sum of the first 100 numbers, which is 5,050, and multiplying by 2. To find the total of the first 100 numbers, multiply 50 by 101. read more
The sum of the first 100 odd numbers is 10,000. There are 100 odd numbers between 1 and 199, and each pair from the start and end of the sequence (e.g. 1 and 199, 3 and 197, etc.) adds up to 200. Multiplying 50 times 200 equals 10,000. read more