A junk box in your room contains a dozen old batteries, threeof which are totall

Question

A junk box in your room contains a dozen old batteries, threeof which are totally dead. You start picking batteries one at atime (without replacement) and testing them. The probability thatyou have to pick 3 batteries in order to find one that worksis. Please help me with this question! A junk box in your room contains a dozen old batteries, threeof which are totally dead. You start picking batteries one at atime (without replacement) and testing them. The probability thatyou have to pick 3 batteries in order to find one that worksis. Please help me with this question!

Explanation / Answer

P(pick the first dead batterie out of 12 )*P(pick the second deadbatterie out of 11)*P(pick the third dead batterie out of 10)*P(pick a good batterie out of 9)= 3/12* 2/11* 1/10 * 9/9 =1/220 So you have to be very unlucky! Good Luck!

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.