Question

How many ways can 4 student ma be chosen from a class of 30 students is ?

Answer 1

If the order doesn't matter then you have to apply the combination formula:

³⁰C₄ = (30!)/(4!)(30-4)! = 27,405 WAYS

Answer 2

That's we can solve by using a combination algorithm: $C^4_{30}=\frac{30*29*28*27}{4*3*2*1} = 27405$