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you can use a tree diagram
|dw:1435124494372:dw|

its a combination because thats how the book wants me to solve it. lol

really.... wow... I think the book lacks sufficient information in the question ...

the 3/20^2 is the number of potential outcomes right?

There are 3 positions for the cracked cane to appear. 3C1 = 3.

its a probability of combinations question according to the book

that is on the 1st choice... then what happens...do you have 1 fewer to choose from..?

I wonder if the tree diagram returns the same answer... that would be freaky...

I don't understand where \[(\frac{ 3}{ 20 })^{2}\] comes into play

perhaps the book has the answer

then draw a diagram... and assign probabilities...

@campbell_st I wish, I tried, I've been banging my head on this problem for 2 hours

well tree diagrams are a starting point in counting techniques and probabilities

crap the answer he typed out just disapeared before I could get it

what answer is in the book..?

I have 4 multiple choice answers
A) 0.2484
B) .3466
C) .1552
D).0447

One of those choices is obtained by using my last posted equation.

Not surprisingly the tree diagram gives the correct answer also :)

wow... what a fluke.... the tree diagram does it without formulae... and it doesn't do your head in

@campbell_st Your result was no fluke. Please take credit where its due.

well I hope it helps you pass your exam

awesome thank you again!!

You're welcome :)