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7. Permutations and Combinations
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Q36 of 64 Page 122

The number of 5-digit telephone numbers having atleast one of their digits repeated is

Formula:- (i)nPr=


Total of of 5-digit telephone numbers=


If no number is repeated=10P5


The number of 5-digit telephone numbers having atleast one of their digits repeated is


=105-10P5



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Questions · 64
7. Permutations and Combinations
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