Sum of odd numbers from 2 to 200


Sum of odd number

What is the sum of odd numbers from 2 to 200? Here we will show you step-by-step how to calculate the sum of odd numbers from 2 to 200.

Step 1) We start by finding the first (F) and last (L) odd numbers from 2 to 200. It is easy to do that by simply looking at the numbers. The first odd number is 3, and the last odd number is 199.

F = 3
L = 199

Step 2) Next, we calculate the total odd numbers (T) there are from 2 to 200, using a formula. Here is the formula and the math:

T = (L - F + 2) ÷ 2
T = (199 - 3 + 2) ÷ 2
T = 198 ÷ 2
T = 99

Step 3) Finally, we use the information from Step 1 and Step 2, and another formula, to calculate the sum of odd numbers from 2 to 200, like this:

Sum = (T ÷ 2) × (2 × F + (2 × (T - 1))
Sum = (99 ÷ 2) × (2 × 3 + (2 × (99 - 1))
Sum = 49.5 × (6 + 196)
Sum = 49.5 × 202
Sum = 9999
Sum of odd numbers from 2 to 200 = 9999


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