Math, asked by saisivani14, 6 months ago

the number of four digit telephone numbers having at least one of their digits repeated is

Answers

Answered by santhiprasanthi188

0

Answer:

10^4-1-10P4

=10000-1-10!/(10-4)!

=9999-10×9×8×7

=9999-5040

=4959

Answered by skmunwar79

0

Answer:

Step-by-step explanation:

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