5,7
11,13
17,19
29,31
41,43
Twin primes between 50 and 100 are {59, 61} and {71, 73}.
41 and 43 are only the pair of Twin primes between 40 and 50.
All the twin primes between 50 and 100 are (53, 59) (61, 67) (71, 73) (79, 83) (89, 91)
The twin primes in this range are 59 & 61 and 71 & 73.
25. any number in half equals how many twin primes. so 50/2 =25 EX.1-2 =1 1-10 = 5
59, 61 71, 73
9.
The two pairs 59 & 61, 71 & 73.
All pairs of two primes are coprime. There are fifteen primes under 50. So that means there are 105 unique pairs of "coprime primes", or more generally, pairs of primes, under 50.
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Any number greater than one can be co-prime. I guess the answer is 49.
There are 731 pairs.