Question 25

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Jambmaths question: 

A final requires that a student answer 4 out 6 questions. In how many ways can this be done?

Option A: 

30

Option B: 

20

Option C: 

15

Option D: 

45

Jamb Maths Solution: 

$^{6}{{C}_{4}}=\frac{6!}{4!(6-4)!}=\frac{6!}{4!2!}=\frac{6\times 5\times 4!}{4!\times 2!}=15$

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