Question

A school supply closet contains a box of 21 AA batteries. After testing the batteries, only 10 of them worked. What is the probability of selecting a battery that works followed by a battery that doesn't work without replacing the first?
A: 110/441 B: 11/42 C: 3/14 D: 10/49

Answer 1

@Xmoses1

Answer 2

@Megan_xoxo1806

Answer 3

medals for best answer

Answer 4

Part 1:\[\frac{ 10 }{ 21 }\]Part 2:\[\frac{ 11 }{ 20 }\]---------------\[\frac{ 10 }{ 21 }\times \frac{ 11 }{ 20 }=\frac{ 11 }{ 42 }\]

Answer 5

Thank you!

Answer 6

Welcome.