- A17 and 71
- B21 and 12
- C27 and 72
- D39 and 93
Step-by-Step Solution
17 and 71 are both prime, so reversing the digits keeps it prime. In the other pairs at least one number is composite , etc.).
Answer: A) 17 and 71
Reena thinks of a two-digit number. When she reverses its digits she gets another number, and BOTH numbers are prime. For example, 13 and 31 are both prime.
Which of the following is another such pair?
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