This means there are a total of 24 odd prime numbers from 1 to 100. And 2 is a prime number but it is not an odd number. It is to be noted that there are some odd numbers that are not prime numbers like, 9, 15, 21, 25 and so on. And odd numbers are those numbers that are not divisible by 2. We know that prime numbers are numbers that have only 2 factors, 1 and the number itself. There are 50 even numbers and 50 odd numbers from 1 to 100. So, the sum of all odd numbers from 1 to 100 is 2500. S = n/2(first odd number + last odd number) There are a total of 50 odd numbers, so n = 50. The sum of all odd numbers from 1 to 100 can be found by using the formula, S = n/2(first odd number + last odd number), where n is the total number of odd numbers from 1 to 100.
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