A doctor has taken a vaccine from either storage unit P (which contains 30 current and 10 outdated vaccines), or from unit Q (which contains 20 current and 20 outdated vaccines), or from unit R (which contains 10 current and 30 outdated vaccines), but she is twice as likely to have taken it from unit P as from unit Q and twice as likely to have taken it from unit Q as from unit R.
A doctor has taken a vaccine from either storage unit P (which contains 30 current and 10 outdated vaccines), or from unit Q (which contains 20 current and 20 outdated vaccines), or from unit R (which contains 10 current and 30 outdated vaccines), but she is twice as likely to have taken it from unit P as from unit Q and twice as likely to have taken it from unit Q as from unit R.
Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.4: Applications
Problem 28EQ
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