Adding up all the even numbers from the first (2) to the fiftieth (100): [(100 + 2) / 2] x 50 = 2550 Can you see the logic of this method?
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The prime numbers between 101 and 120 inclusive are: 101, 103, 107, 109, 113
There are 101 numbers between 0 and 100. Because it starts with an even number and ends with an even number, there is 1 less odd number than even. So 51 even and 50 odd.
The sum of numbers from 1 to 101 can be calculated using the formula for the sum of an arithmetic series, which is n/2 * (first term + last term), where n is the number of terms. In this case, the first term is 1, the last term is 101, and there are 101 terms in total. Plugging these values into the formula, we get 101/2 * (1 + 101) = 101/2 * 102 = 5151. Therefore, the sum of numbers from 1 to 101 is 5151.
number of prime numbers between 51 and 101 = 10prime numbers between 51 and 101 = 53, 59, 61, 67, 71, 73, 79, 83, 80, 97
The numbers 101, 103, 107, 109, 113, 127, 131, 137, 139 and 149 are prime (including the boundaries).