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young_gun
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in how many ways can you seat 3 students in a row of 10 07 Nov 2007, 15:01
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in how many ways can you seat 3 students in a row of 10 empty chairs...no restrictions.



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in how many ways can you seat 3 students in a row of 10 07 Nov 2007, 15:04
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young_gun
in how many ways can you seat 3 students in a row of 10 empty chairs...no restrictions.
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10C3
=10! / 7!3!
= (10*9*8)/(3*2)
=5 * 3 *8
=3*40
=120
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trivikram
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in how many ways can you seat 3 students in a row of 10 07 Nov 2007, 19:07
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young_gun
in how many ways can you seat 3 students in a row of 10 empty chairs...no restrictions.

10C3
=10! / 7!3!
= (10*9*8)/(3*2)
=5 * 3 *8
=3*40
=120
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Again the 3 students can be arranged among themselves in 3! ways

= 120*6 = 720
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GMAT TIGER
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in how many ways can you seat 3 students in a row of 10 07 Nov 2007, 20:36
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trivikram
bmwhype2
young_gun
in how many ways can you seat 3 students in a row of 10 empty chairs...no restrictions.

10C3
=10! / 7!3!
= (10*9*8)/(3*2)
=5 * 3 *8
=3*40
=120

Again the 3 students can be arranged among themselves in 3! ways

= 120*6 = 720
Show more


agreed.

= 10 x 9 x 8
= 720
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GMATBLACKBELT
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in how many ways can you seat 3 students in a row of 10 07 Nov 2007, 23:23
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young_gun
in how many ways can you seat 3 students in a row of 10 empty chairs...no restrictions.
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If ur familiar w/ MGMAT method try usin anagram method

We have: students ABC seats XXXXXXXXXX

So 3 students will occupy 3 seats so
XXXXXXXXXX
123 NNNNNNN

Essentially its written like this 10!/1!1!1!7! --->
10*9*8-> 720



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!