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प्रश्न
Find n(S) of the following random experiment.
3 tickets are drawn from a box containing 20 lottery tickets.
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उत्तर
3 tickets can be drawn from a box containing 20 lottery tickets in 20C3 ways.
∴ n(S) = 20C3
= `(20*19*18)/(1*2*3)`
= 1140
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