Question
3 batteries are chosen at random from 15 batteries of which 5 are defective. Find the probability if:
1) none of 3 are defective
2) exactly one is defective
3) 2 defective and 1 non-defective
4) at least one is non-defective
What should I do? Is it permutation or a combination? how do you solve it? Please help me. :(
1) none of 3 are defective
2) exactly one is defective
3) 2 defective and 1 non-defective
4) at least one is non-defective
What should I do? Is it permutation or a combination? how do you solve it? Please help me. :(