# SOLUTION: A bag contains a total of 30 batteries, of which six are defective. Selecting four at random, without replacement, determine the probability that none of the batteries you select

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 Click here to see ALL problems on Probability-and-statistics Question 408387: A bag contains a total of 30 batteries, of which six are defective. Selecting four at random, without replacement, determine the probability that none of the batteries you select are good. (Points : 2) Answer by stanbon(57347)   (Show Source): You can put this solution on YOUR website!A bag contains a total of 30 batteries, of which six are defective. Selecting four at random, without replacement, determine the probability that none of the batteries you select are good. --------------- # of ways to get 4 bad: 6C4 # of ways to select 4 without condition: 30C4 ---- P(select 4 good) = 6C4 / 30C4 = (6*5*4*3)/(30*29*28*27) = 0.0005473... ---------- Cheers, Stan H. ================