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प्रश्न
Suppose there are 10 students in your class. You want to select three out of them. How many samples are possible?
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उत्तर
Population = 10
Number of possible samples = `""^nC_r=""^10C_3`
`= (10!)/(3!(10-3)!)`
`=(10!)/(3!7!)`
= 120
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