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Your partner chooses two beads and places them side by side behind a screen. What is the minimum number of guesses you would need to be sure of guessing the two beads and their positions?

Flippin' Discs

Discs are flipped in the air. You win if all the faces show the same colour. What is the probability of winning?

Odds and Evens

Are these games fair? How can you tell?

At Least One...

Age 11 to 14
Challenge Level

If there isn't at least one head, what must be true about every flip of the coin?