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B. 31
C. 51
D. 81
16 Which of the numbers is a prime number? A 21
17. What is the difference between the lowest prime number and the highest prime
number from 1 - 100? A 65 B.75
C. 85 D. 95
B. 47 C. 57 D. 77
18. Which of these numbers is a prime number? A. 27
19 Which of these numbers is a composite number? A 23 B. 43
B. 43 C. 73
C. 93​