Question 11

From the set of prime numbers between 50 and 100, how many pairs of prime are there that add up to a prime number?

Solution

Prime numbers between 50 and 100 are : 53,59,61,67,71,73,79,83,89,97.

So, if we add any two of these numbers ,then we get 0,2,4,6 or 8 as unit digit.

So, that number will be divisible by 2, which means that the number is not a prime number.

C is correct choice.

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