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Sagot :
The number of combination possible = 15625
When the numbers are repeating
The number of possible combinations = 13800
Given that a certain combination lock requires three selections of numbers
Total possible numbers = 25
Part a
Total number of combinations possible = 25 × 25 × 25
Multiply the numbers
= 15625 possible combinations
Part b
The given condition is no number may be used twice
Total number of combinations possible = 25 × 24 × 23
Multiply the numbers
= 13800 possible combinations
Therefore, when the number are repeating, the possible combinations are 15625 and when the numbers are not repeating the possible combinations are 13800
Learn more about combinations here
brainly.com/question/2295036
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