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Positive integers

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Positive integers  [#permalink]

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New post 02 Jun 2009, 19:15
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Q11
Of the three-digit positive integers that have no digits equal
to zero, how many have two digits that are equal to each
other and the remaining digit different from the other two?
A. 24
B. 36
C. 72
D. 144
E. 216

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Re: Positive integers  [#permalink]

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New post 02 Jun 2009, 22:03
No of ways selecting similar digits X No of ways to select a different digit X No of ways these can be arranged amongst themselves
9X8X3=216
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Re: Positive integers  [#permalink]

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New post 02 Jun 2009, 22:06
sondenso wrote:
Q11
Of the three-digit positive integers that have no digits equal
to zero, how many have two digits that are equal to each
other and the remaining digit different from the other two?
A. 24
B. 36
C. 72
D. 144
E. 216



9C1*8C1 * 3!/2! = 216
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Re: Positive integers  [#permalink]

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New post 03 Jun 2009, 02:53
yeah.. agree.. answer is 16.. 9*8*3
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Re: Positive integers  [#permalink]

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New post 05 Jun 2009, 03:02
Thanks guys,

Full reasonings must be 9*1*8*3=216, also is OA

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Re: Positive integers &nbs [#permalink] 05 Jun 2009, 03:02
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