Question 1168514
if replaced, it is (5/11)^4=0.04269

if not replaced, it is (5/11)(4/10)(3/9)(2/8)=120/7920=0.01515 (repeat)
also
11C4 are the number of outcomes, or 330
5C4 are the ways to choose 4 purple marbles =5
it is 5/330 or 1/66 in this scenario. That is 0.01515...