1.

The number of 5 digit numbers having their at least one ofdigit repeated is :1). 90002). 697603). 100004). none of these

Answer»

No of numbers with REPETITION = 9 X 10 x 10 x 10 x 10 

90000 ( As zero cannot be included at first digit)

No.of numbers without repetition = 9 x 9 x 8 x 7 x 6 

⇒ 27216

∴ No.of numbers with atleast one digit repeated = 90000 − 27216

⇒ 62784

Hence (4) is the correct answer.



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