1. ## Dependant events help?

Question:
In a lots of 20 batteries ,4 are defective .If 2 are chosen without replacement,determine if the events D1 (event of selecting the first battery) and D2(event of selecting the second battery )are dependant.

Attempt:
4/20*15/19...

Am I correct?

2. Originally Posted by mj.alawami
Question:
In a lots of 20 batteries ,4 are defective .If 2 are chosen without replacement,determine if the events D1 (event of selecting the first battery) and D2(event of selecting the second battery )are dependant.

Attempt:
4/20*15/19...

Am I correct?
Your definitions of D1 and D2 make no sense. Do you mean D1 is the event that the first selected battery is defective and D2 is the event that the second defective battery is defective?

3. Originally Posted by mr fantastic
Your definitions of D1 and D2 make no sense. Do you mean D1 is the event that the first selected battery is defective and D2 is the event that the second defective battery is defective?

Yes,I am very Sorry that i forgot to mention those things...

Thank you for mentioning it

4. Originally Posted by mj.alawami
Yes,I am very Sorry that i forgot to mention those things...