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#60 Say what you see
Set by Peter Rowlett
You have three cards labelled A, B and C. You shuffle them and deal them face down onto a table, saying “A, B, C” as you place each card. What is the probability that you say the name of at least one card as you deal it?
What if you add a fourth card, labelling this D, and say “A, B, C, D”?
With six cards you think of two ways to label them. You can have A, B, C, D, E, F and say in order “A, B, C, D,…
