How many permutations does a combination lock have if each combination has three numbers, no two numbers of any combination are equal, and the lock has 45 numbers?
A. 85,137
B. 85,199
C. 85,131
D. 85,140
Answer: D
Mathematics
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A. {x 
B. {x 
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A. x2 + 16x + 60 B. 2x + 60 C. x2 + 16x + 16 D. 2x2 + 60
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A. 4 B. 5 C. 1 D. 3
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