There are 500 wrist watches in a box. Out of these 50 wrist watches are found defective. One watch is drawn randomly from the box. Find the probability that wrist watch chosen is a defective watch.
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Solution
Total number of watches n(S)=500 Number of defective watches n(A)=50 P(A)=n(A)n(S) ⇒P(A)=50500 Probability of watch to be defective =110