The number of five 5-digit telephone numbers having at least one of their digits repeated is
A) 90000
B) 10000
C) 30240
D) 69760
E) None of these
asked by DEEPTI CHABBRA
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4 comments:
its E
its D (10^5 - (10*9*8*7*6))
Wats the right ans? how is it D?
its A..
O cant be there as the most significant digit.
And as atleast one digit can be repeated means that all other digit can have numbers from 0-9.. meaning 10..
Thus, 9*10*10*10*10
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