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Question 30

Using only the digits 1, 2, 4, 5, two-digit numbers are formed. The digits of the two digit number may be the same or different. The number of such two-digit number is


Correct Answer: 16

Solution

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Each of the two digit positions can independently be any of the 4 given digits, so the total number of two-digit numbers is $$4\times4=16$$.

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