A class has 30 students .The class needs to select 3 representatives.In how many ways can this be done ?
Solution
Correct Answer: Option D
³⁰C₃ =30!/(30-3)!3!
=(30×29×28×27)!/ 27!×3×2×1
=4060
=(30×29×28×27)!/ 27!×3×2×1
=4060
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