Q: What twin prime number whose sum is 84?

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Becouse every prime number (except 2) is odd, the sum of 2 prime numbers will always be even (and 2 is the only even prime). The exceptions are 11 and 2 for example; 11 = prime, 2 = prime and 13=prime.

I would say: 43 Or 7

Twin prime pairs having sums less than 120 are (3, 5), (5, 7), (11, 13), (17, 19), (29, 31), and (41, 43). Twin prime numbers having a sum less than 120 are 3 + 5 + 7 + 11 + 13 + 17 + 19 + 29 (totaling 104).

none

The sum of any two prime numbers may or may not be prime. The sum of the two prime numbers 2 and 3 is the prime number 5, and the sum of the two prime numbers 5 and 7 is the composite number 12.

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How about: 199+5 = 204

No.

2 and 3.

17, 53, 71

29 is the answer. 29 is prime. 2+9=11 which is prime. 9-2=7 which is prime.

-5

There are no two numbers whose product is 23 and whose sum is 10. 23 is a prime number, and the only numbers whose product is 23 are 23 and 1. A prime number can only be divided by itself and 1.

3, 5 and 11

37

I think it will be 17. The sum of digits is 8, which is the cube of 2.

53 is prime, and 5+3 = 8.

2 + 3 = 5