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A professor has seven different programming books on a bookshelf

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A professor has seven different programming books on a bookshelf [#permalink]

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A professor has seven different programming books on a bookshelf. Three Java books and
four C++ books. In how many ways the professor can arrange these books on the shelf:

a. If the languages should alternate. (starts with one Java then one C++, then Java and son
on or starts with one C++ then one Java then one C++ and so on.)

b. If the all the C++ books must be next to each other and the Java books must be next to
each other.

Kudos [?]: 0 [0], given: 0

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Joined: 02 Sep 2009
Posts: 43348

Kudos [?]: 139643 [0], given: 12794

Re: A professor has seven different programming books on a bookshelf [#permalink]

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New post 25 Dec 2017, 10:29
Sona20 wrote:
A professor has seven different programming books on a bookshelf. Three Java books and
four C++ books. In how many ways the professor can arrange these books on the shelf:

a. If the languages should alternate. (starts with one Java then one C++, then Java and son
on or starts with one C++ then one Java then one C++ and so on.)

b. If the all the C++ books must be next to each other and the Java books must be next to
each other.


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Kudos [?]: 139643 [0], given: 12794

Re: A professor has seven different programming books on a bookshelf   [#permalink] 25 Dec 2017, 10:29
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