Algebra: Counting principle and permutations

label Algebra
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If no digit appears more than once, how many 2-digit numbers can be formed from the following digits? 1,3,4,6

May 6th, 2015

4P2 =  

4!/2! = 4 *3 *2 *1/ 2 *  = 12 


Regarding any clarification plz let me know 

May 6th, 2015

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