Q663
A two-digit number, 9A, is a prime number. Find A.
A.
9
B.
7
AnswerC.
3
D.
1
Answer: Option B
Solution
Answer: Option B
Solution:
9A is prime number then by option, 9AOption 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