Free Practice Question
PS · Problem Solving
505-555
Algebra
An integer is considered 'unique' if all of its digits are different. For instance, 58 is 'unique' while 22 is not. How many 'unique' two-digit numbers exist?
Answer Choices
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70
B
72
C
81
D
90
E
91
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Explanation
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Comments
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L
LightingJan 15, 2025
Great question!
Details
Difficulty
505-555
Type
PS
Category