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Question

How many number of 5digit telephone numbers be formed having atleast one of their digits repeated.

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Solution

No:of Digits in telephone no = 5
No:of digits with repletion =(10)5
No:of digits without repetition 10×9×8×7×6
30240
No : of no with at least are digit replicated
100,00030,240
69,760
ReqdNo:69760

1124890_1140127_ans_d35e2fd451224da88aa2a471a75484be.jpeg

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