Question
The number of 5 digit telephone numbers having at least one of their digits repeated is? (0 can be the starting digit of the number)
Answer: Option D
:
D
Total number of 5 digit telephone numbers which can be formed using digits 0,1,2…9 is 105
Number of 5 digit numbers having not even a single digit repeated is 10P5 = 30240
Required number of telephone numbers = 105 -30240 = 69760
Was this answer helpful ?
:
D
Total number of 5 digit telephone numbers which can be formed using digits 0,1,2…9 is 105
Number of 5 digit numbers having not even a single digit repeated is 10P5 = 30240
Required number of telephone numbers = 105 -30240 = 69760
Was this answer helpful ?
More Questions on This Topic :
Latest Videos
Latest Test Papers
Submit Solution