....with apologies if you've seen it before.
You are the winner of a TV quiz show.
As your prize you are allowed to choose one of three boxes.
Two of the boxes each contain a cheque for £100.
The other box contains a cheque for £10,000.
The quiz master knows what is in each box.
He tells you that you can choose a box but not open it, which you do.
He will then open one of the other boxes and show you what is in it.
He will choose a box with £100 cheque in it and show you the cheque for £100.
He will then ask you if you would like to change your mind and pick the other remaining box or stick with your original choice.
Should you:-
A) Keep to the original choice.
B) Do what ever you like as the chances of winning the £1000 are the same for each box namely one chance in two.
C) Change your mind and go for the other remaining box.
Give your answer as A or B or C.
