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2014-11-01T00:55:51+05:30

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We can choose 1 student from 40 students in ⁴°C₁ ways.
So a set of 4 students can be chosen in = ⁴°C₁×⁴°C₁×⁴°C₁×⁴°C₁ ways

⁴°C₁ = 40!/(1!×39!) = 40

So total number of ways = 40×40×40×40 = 2560000
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2014-11-01T10:14:37+05:30
We can choose 1 student from 40 students in ⁴°C₁ ways.
So a set of 4 students can be chosen in = ⁴°C₁×⁴°C₁×⁴°C₁×⁴°C₁ ways

⁴°C₁ = 40!/(1!×39!) = 40

So total number of ways = 40×40×40×40 = 2560000

so the answer remains the same

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