Valentine’s day and maths

There is a chance of 40% that Jack will marry Jessica and a chance
of 60% that Jessica will marry John.
I) What is the name given to these events, events that their chance
together is 100%?
ii)If Jessica marries Jack there is a chance of 30% she will be happy,
but if she marries John, there is a chance of 60% she will be happy.
What is the chance of Jessica being happy after marriage?

2 thoughts on “Valentine’s day and maths”

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>