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

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Math Expert
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Joined: 02 Sep 2009
Posts: 58427
The numbers of five-digit telephone numbers having at least one of the  [#permalink]

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New post 30 Jan 2019, 00:37
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

71% (02:02) correct 29% (02:47) wrong based on 24 sessions

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GMAT Club Legend
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Joined: 18 Aug 2017
Posts: 5032
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
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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, 02:00
1
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
GMAT Club Bot
Re: The numbers of five-digit telephone numbers having at least one of the   [#permalink] 30 Jan 2019, 02:00
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