1.

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

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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