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Let p be a prime number between 40 and 60. What is the probability that p + 20 is also a prime number? Express your answer as a common fraction.

 Dec 28, 2020
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41  43  47  53  59  >>>Total= 5 primes between 40 and 60

 

 

41 + 20 =61 is prime

43 + 20=63 not prime

47 + 20 =67 is prime

53 + 20 =73 is prime

59 + 20 =79 is prime.

 

Probability = 4 / 5

 Dec 28, 2020

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