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A phone passcode has 4 digits chosen from 0 to 9 with repetition allowed. How many passcodes exist?
A5040
B10000
C1000
D9000
Answer & Solution
Correct answer: B. 10000
Each of the 4 places can hold any of 10 digits, so 10 x 10 x 10 x 10 = 10000.
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