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The numbers of five-digit telephone numbers having at least one of the

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The numbers of five-digit telephone numbers having at least one of the  [#permalink]

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New post 29 Jan 2019, 23:37
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A
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Difficulty:

  35% (medium)

Question Stats:

70% (02:23) correct 30% (03:17) wrong based on 13 sessions

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The numbers of five-digit telephone numbers having at least one of their digits repeated is:

(A) 23,560
(B) 30,240
(C) 69,760
(D) 90,000
(E) 100,000
Spoiler: OA

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Re: The numbers of five-digit telephone numbers having at least one of the  [#permalink]

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New post 30 Jan 2019, 01:00
Bunuel wrote:
The numbers of five-digit telephone numbers having at least one of their digits repeated is:

(A) 23,560
(B) 30,240
(C) 69,760
(D) 90,000
(E) 100,000


No of numbers with repetition =10×10×10×10×10
100000
No.of numbers without repetition =10×9×8×7×6
30240
No.of numbers with atleast one digit repeated =10,0000−30240
69760
IMO C
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Re: The numbers of five-digit telephone numbers having at least one of the   [#permalink] 30 Jan 2019, 01:00
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