How many 2 digit numbers can be formed using the digits 1,2,3 if repetition of digits is not allowed?

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A 3
B 6
C 9
D 12

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Answer: B. 6

The possible numbers are 12,13,21,23,31,32.Since order matters,and we cannot repeat a digit,we have 3 options for the first digit and 2 optiond for the second.3×2=6

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How many 2 digit numbers can be formed using the digits 1,2,3 if repetition of digits is not allowed?

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