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John has a drawer containing 5 black pens, 6 blue pens, 3 mechanical

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John has a drawer containing 5 black pens, 6 blue pens, 3 mechanical  [#permalink]

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New post 26 Nov 2017, 09:08
1
3
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

71% (01:01) correct 29% (01:27) wrong based on 99 sessions

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Math Expert
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Re: John has a drawer containing 5 black pens, 6 blue pens, 3 mechanical  [#permalink]

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New post 26 Nov 2017, 09:10
Bunuel wrote:
John has a drawer containing 5 black pens, 6 blue pens, 3 mechanical pencils and 9 wood pencils. If John reaches into the drawer and selects randomly how many writing tools must he remove in order to ensure that he will select one of each type?

A. 23
B. 21
C. 20
D. 15
E. 4


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Re: John has a drawer containing 5 black pens, 6 blue pens, 3 mechanical  [#permalink]

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New post 26 Nov 2017, 09:29
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D. 15
Suppose he selects 5 black pens and then 6 blue pens and 3 mechanical pencils. To reach the wood pencil he should have chosen 14 items already and with the 15th item he chose he would have chosen one of each type.
Hence D


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Re: John has a drawer containing 5 black pens, 6 blue pens, 3 mechanical  [#permalink]

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New post 26 Nov 2017, 09:43
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Sasindran wrote:
D. 15
Suppose he selects 5 black pens and then 6 blue pens and 3 mechanical pencils. To reach the wood pencil he should have chosen 14 items already and with the 15th item he chose he would have chosen one of each type.
Hence D


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hi..

your approach is correct but you could not take it to logical end..

Solution

5 black pens, 6 blue pens, 3 mechanical pencils and 9 wood pencils
we have to take the worst case scenario, so here think that you will get the LEAST numbered thing in the end, which here is 3 mechanical pencils..

so he picks up 5 black pens, 6 blue pens, 3 mechanical pencils and 9 wood pencils = 5+6+9=20
and then he picks up a mechanical pencil so 21

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Re: John has a drawer containing 5 black pens, 6 blue pens, 3 mechanical  [#permalink]

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New post 04 Aug 2019, 05:07
Bunuel wrote:
John has a drawer containing 5 black pens, 6 blue pens, 3 mechanical pencils and 9 wood pencils. If John reaches into the drawer and selects randomly how many writing tools must he remove in order to ensure that he will select one of each type?

A. 23
B. 21
C. 20
D. 15
E. 4


(5+6+9) worst case + 1
therefore, 21
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Re: John has a drawer containing 5 black pens, 6 blue pens, 3 mechanical   [#permalink] 04 Aug 2019, 05:07
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