MathProbabilityEvents and probabilities

Calculating cardinality

Theory

Count them all!

Report a typo

Each problem has its own set of solutions. Make all pairs "task + answer":

Match the items from left and right columns
To rearrange 55 objects
To flip two-sided coin
To choose 22 objects out of 55
C52C_5^2 different ways
5!5! different ways
252^5 outcomes
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