Q.1) The positive integers A, B, A - B and A + B are all prime numbers. The sum of these four primes is
(A) even
(B) divisible by 3
(C) divisible by 5
(D) prime
Answers
How to find the sum of prime numbers up to a prime number n, that is for example: the sum of prime numbers up to 7 is: 2+3+5+7=17. Also if we have the sum of an even number of primes then would it be a new prime? Example: 2+3+5+7=17 and 17 is a prime. 2+3+5+7+11+13=41 and 41 is prime.
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there are 25 prime numbers are there in less than 100. 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97. and sum of all these numbers is 1060.
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[I presume you want the sum of the prime numbers from 1 to 100. The prime numbers from 1 to 100 are: 2,3,5,7,11,13,17,19,23,29,31,37,41,47,53,59,61,67,71,73,79,83,89,97.]