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Thursday, February 15, 2007
"GRE QUESTION ON DEMAND"
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
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
its E
ReplyDeleteits D (10^5 - (10*9*8*7*6))
ReplyDeleteWats the right ans? how is it D?
ReplyDeleteits A..
ReplyDeleteO 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