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A box contains tickets numbered 1 to 20. 3 tickets are drawn

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Intern
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Joined: 01 Jan 2016
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A box contains tickets numbered 1 to 20. 3 tickets are drawn  [#permalink]

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New post 24 Jul 2017, 10:38
1
1
00:00
A
B
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D
E

Difficulty:

(N/A)

Question Stats:

50% (00:25) correct 50% (01:04) wrong based on 8 sessions

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A box contains tickets numbered 1 to 20. 3 tickets are drawn from the box with replacement. The probability that the largest number on the ticket is 7 is

(1) 2/19
(2) 7/20
(3) (7^3 -1)/ (20)^3
(4) (7/20)^3
(5) None of these

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Re: A box contains tickets numbered 1 to 20. 3 tickets are drawn  [#permalink]

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New post 24 Jul 2017, 11:01
There are 7 cards out of 20 you can draw to make the highest no. as 7. With replacement means you put it back inside after each drawn. So the probability should be (7/20)^3
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Re: A box contains tickets numbered 1 to 20. 3 tickets are drawn  [#permalink]

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New post 24 Jul 2017, 11:14
The answer is (7^3 -1)/ (20)^3?

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This discussion does not meet community quality standards. It has been retired.


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Re: A box contains tickets numbered 1 to 20. 3 tickets are drawn   [#permalink] 24 Jul 2017, 11:14
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A box contains tickets numbered 1 to 20. 3 tickets are drawn

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