Discussion
The missing number (?) in the following :
43, 47, 53, 59, ? , 67, 71, 73 is :
Answer: A
The missing number is 61.
The sequence lists the consecutive prime numbers: 43, 47, 53, 59, 61, 67, 71, 73. The prime between 59 and 67 is 61.
60 and 65 are not prime (60 is even, 65 = 5 × 13), and 63 = 7 × 9 is not prime either.
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