How many 2 digit numbers can you make by using 1,2,3,4
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It depends on whether repetition is allowed or not:
(1) Repetition allowed : There are 4 choices for both positions, so4×4=164×4=162-digit numbers can be formed.
(2) Repetition not allowed : There are 4 options for tens position, and three options for ones position. Therefore,4×3=124×3=122-digit numbers can be formed.
It depends on whether repetition is allowed or not:
(1) Repetition allowed : There are 4 choices for both positions, so 4×4=164×4=16 2-digit numbers can be formed.
(2) Repetition not allowed : There are 4 options for tens position, and three options for ones position. Therefore, 4×3=124×3=12 2-digit numbers can be formed.
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How many 2 digit numbers can you make
->i can make 24 numbers by using 1,2,3,4