Ouantitative Reasoning-Help?

[Nismoboy]

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A panel of 3 people is to be selected from a group of 5 different people? How many different possible panels are there?

A) 10 (answer)
B) 12
C) 15
D) 20
E) 60

My question is how did they get it and if there is a formula to figure it out?

Thanks

 

[zimaad]

When you hear a stat prof talk about a problem like this, they may say "5 choose 3". And the formula is

n!/((p!)x(n-p)!)
where p = # people chosen and n = total number people there

or 5!/(3!x2!)

= (5x4x3x2x1)/((3x2x1)x(2x1)) = 10

 

[zimaad]

oh yeah..forgot to say this also. If you want to look up an equation in a book look up "combinations". Generally speaking, the number of combination of n distinct objects taken r at a time is

n! / (r! x (n-r)!)

 

[Nismoboy]

Thanks a lot. I remember that equation now. I took it in Statistical Inference. You've been a great help, congrats on getting in by the way.

 

[R3D2P1]

Zimaad I p'med you!