victor borrowed $21.50 from his mother to go to the theater.A week later he paid her $21.50 back. how do he still owe her?
1 answer:
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Events
• A: an even number is rolled in the first time
,• B: a number greater than 3 is rolled the second time
The probability of rolling an even number is:
The probability of rolling a number greater than 3 is:
Events A and B are independent, then the probability of one happening after the other is:
The ODE is linear:
Multiplying both sides by gives
Notice that the left side can be condensed as the derivative of a product:
Integrating both sides with respect to yields
Since ,
so that