Question 180888
Two balls are to be selected without replacement from a bag containing one red, one blue, one green, one yellow, and one black ball. How many points are there in the sample space? 
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"Without replacement" is a very important phrase.
It makes the 2nd selection dependent on the 1st.
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1st selection : 5 ways
2nd selection : 4 ways
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# of points in the sample space = 5*4 = 20
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cheers,
Stan H.