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# In how many ways is it possible to sit two people in a row

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Intern
Joined: 31 Mar 2004
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In how many ways is it possible to sit two people in a row [#permalink]

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30 Jun 2004, 06:01
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In how many ways is it possible to sit two people in a row of four seats if there must be

A.. one space in between them

B... At least one space in between them
Senior Manager
Joined: 26 Jan 2004
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30 Jun 2004, 06:40
A) 4
a-b-
-a-b
-b-a
b-a-

B)6
(4 combinations as mentioned above)+
a--b
b--a
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30 Jun 2004, 06:53
I am not pretty sure but this is my try

I will slove it by the simple way
a)
the seat 1 2 3 4

the possibility 2 - 1 -= 2

the possibility - 2 - 1= 2

The total or possible ways = 2+2=4
b)
2 - - 1= 2
1 - - 2= 2
THe total of possible ways = 2+2=4

Correct me if I am mistaken

BTW if any one know another way to solve it please share it with the club.

Good luck all
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30 Jun 2004, 20:16
mba is right on this one
sabr, IMO the easiest way for a problem where there is a limited # of possible outcomes is to just draw them out as mba did.
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Best Regards,

Paul

30 Jun 2004, 20:16
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# In how many ways is it possible to sit two people in a row

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