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The number of 5-digit telephone numbers having at least one of their digits repeated is(a) 90,000(b) 10,000(c) 30240(d) 69760 |
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Answer» The number of 5-digit telephone numbers having at least one of their digits repeated is (a) 90,000 (b) 10,000 (c) 30240 (d) 69760 |
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