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A two-digit number 9A is a prime number Find A

This question belongs to Arithmetic Ability Number System
Number System
?

A two-digit number, 9A, is a prime number. Find A.

Answer & Solution
Correct Answer: Option B
9A is prime number then by option, 9A
Option A: A = 9, Number = 99 → Composite
Option B: A = 7, Number = 97 → Prime
Option C: A = 3, Number = 93 → Composite
Option D: A = 1, Number = 91 → Composite
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