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rxs0005
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3 men and 3 women need to be seated in 2 rows with 3 chairs 28 Sep 2010, 06:47
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70% (00:55) correct 30% (01:01) wrong based on 187 sessions

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3 men and 3 women need to be seated in 2 rows with 3 chairs in each row. All men have to be seated in the back row . How many ways can this be done.

A. 6
B. 12
C. 24
D. 36
E. 72
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Bruno2000
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3 men and 3 women need to be seated in 2 rows with 3 chairs 28 Sep 2010, 07:01
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_ _ _ = 3! ways women can be seated
_ _ _ = 3! ways men can be seated
3! x 3!= 36 ways total
Does anyone else agree?
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rxs0005
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3 men and 3 women need to be seated in 2 rows with 3 chairs 28 Sep 2010, 07:10
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I agree

what i had a doubt was since men have to be in the back row thats 3! ways and because of this women will be in the front row thats 3! why cant it be 6 + 6 = 12 ways since the row restriction is already in place
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3 men and 3 women need to be seated in 2 rows with 3 chairs 28 Sep 2010, 07:22
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rxs0005
I agree

what i had a doubt was since men have to be in the back row thats 3! ways and because of this women will be in the front row thats 3! why cant it be 6 + 6 = 12 ways since the row restriction is already in place

Principle of Multiplication
If one event can occur in \(m\) ways and a second can occur independently of the first in \(n\) ways, then the two events can occur in \(mn\) ways.

Or consider this: for one particular arrangement of men, say {m1, m2, m3} women in the front row can be arranged in 3!=6 ways, as total # of arrangements of men is 3!=6 then total # of arrangements of men and women is 3!*3!=36.

Hope it's clear.
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3 men and 3 women need to be seated in 2 rows with 3 chairs 28 Sep 2010, 08:09
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Front: 3! = 6

Back: 3! = 6

6*6=36
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3 men and 3 women need to be seated in 2 rows with 3 chairs 13 May 2023, 03:59
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Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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