Question

5. give examples for each of the following:

a. two prime numbers whose sum is also a prime number.
b. two prime numbers whose difference is also a prime number.
c. two prime numbers haveing same digits like 13 and 31.
d. two composite numbers less than 100 ending with 9.​

Answer 1

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(a) 5 and 7

(b) 2 and 5

(c) 17 and 71

(d) 39 and 69

Answer 2

a) 2+3=5
b)7-5=2
c) 17,71
d) 49,99