# Chapter 12 Sequences and Series - Cumulative Review - Page 848: 30

See below.

#### Work Step by Step

Since the events are independent, $P(\text{A and B})=P(A)P(B)$, thus $P(B)=\frac{P(\text{A and B})}{P(A)}=\frac{0.2}{0.25}=0.8$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.