Calculating Probability of Withdrawing 3 Discs in Any Order

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How to calculate the probabilty of withdrawing 3 discs A B C from a bag, in any particular order? I just need the basic idea behind it
 
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I assume there are no other discs in the bag. In that case, withdrawing the right disc first is 1/3. I will assume you keep it out. Then choosing the right second disc is 1/2. Therefore the overall probability is 1/6.
 

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