I have a packet of M&Mís. M&Mís come in six possible colours: red, green,can be sure I have:
blue, orange, yellow and brown. How many M&Mís need to be in the packet so that I
(a) At least five M&Mís of one colour.
(b) At least nine M&Mís of one colour.
(c) At least five red M&Mís.
Here are the answers (which I believe are correct)
(c) Impossible. There could be far too many non-reds.
Could someone explain to me how they worked out those answers for part (a) and part (b)? Why did they times those numbers?