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Raffle tickets numbered consecutively from 151 through 352 are placed

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Raffle tickets numbered consecutively from 151 through 352 are placed  [#permalink]

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New post 14 Oct 2019, 03:33
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A
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Difficulty:

  45% (medium)

Question Stats:

59% (01:37) correct 41% (01:45) wrong based on 41 sessions

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Raffle tickets numbered consecutively from 151 through 352 are placed in a box. What are the chances that a ticket selected at random will have a number with a tens digit of 7?

A. 2/7
B. 3/15
C. 10/101
D. 20/201
E. 21/201

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Re: Raffle tickets numbered consecutively from 151 through 352 are placed  [#permalink]

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New post 14 Oct 2019, 03:41
dcummins wrote:
Raffle tickets numbered consecutively from 151 through 352 are placed in a box. What are the chances that a ticket selected at random will have a number with a tens digit of 7?

A. 2/7
B. 3/15
C. 10/101
D. 20/201
E. 21/201


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https://gmatclub.com/forum/lottery-tick ... 69315.html (e-GMAT)
https://gmatclub.com/forum/raffle-ticke ... 24260.html (MGMAT)
https://gmatclub.com/forum/a-bowl-conta ... 50544.html (Princeton Review)
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Re: Raffle tickets numbered consecutively from 151 through 352 are placed  [#permalink]

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New post 14 Oct 2019, 06:05
dcummins wrote:
Raffle tickets numbered consecutively from 151 through 352 are placed in a box. What are the chances that a ticket selected at random will have a number with a tens digit of 7?

A. 2/7
B. 3/15
C. 10/101
D. 20/201
E. 21/201


Total number of digits with 7 in ten's digit from 151 through 352 = {157, 167, 177, . . . . . . . . . 347} = 20
Total digits = 352 - 151 + 1 = 202

Probability = 20/202 = 10/101

IMO Option C
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Re: Raffle tickets numbered consecutively from 151 through 352 are placed  [#permalink]

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New post 14 Oct 2019, 09:17
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dcummins wrote:
Raffle tickets numbered consecutively from 151 through 352 are placed in a box. What are the chances that a ticket selected at random will have a number with a tens digit of 7?

A. 2/7
B. 3/15
C. 10/101
D. 20/201
E. 21/201


integers from 151 to 299 with 7 as tens place ; 2*1*10 ; 20
and from 300 to 352 7 as tens place =0 so total 20
total tickets ; 352-151+1 ; 202
P ; 20/202 ; 10/101
IMO C
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Re: Raffle tickets numbered consecutively from 151 through 352 are placed  [#permalink]

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New post 15 Oct 2019, 03:48
7 is in the ones digit not tens

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Re: Raffle tickets numbered consecutively from 151 through 352 are placed  [#permalink]

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New post 15 Oct 2019, 05:10
Arindamad wrote:
7 is in the ones digit not tens

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The question asks for 7 in the 10s digit’s place. So x7x
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Re: Raffle tickets numbered consecutively from 151 through 352 are placed   [#permalink] 15 Oct 2019, 05:10
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