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.
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
