a box of 12 dozen pens contains a dozen defective pens. one pen is taken out at random. what is the probability that the pen taken out is non defective.
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Answer:
11/12
Step-by-step explanation:
no. of pens = 12 dozen = 12 x 12 = 144.
no. of defective pens = 12.
therefore no. of non-defective pens = 144 - 12 = 132.
thus 132/144 = probability of not getting a defective pen.
therefore 132/144 = 11/12.
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