Tuesday, January 10, 2017

Navy Rat Snail lottery

A peculiar lottery is played in an eastern country. Three tokens are randomly drawn (without replacement) from a bag of fourteen tokens. Each token has a unique mark, one of the national symbols of the region:

Navy
Milk
Ogee
Pot
Quill
Rat
Snail
Tuber
Uvala
Vole
Whelp
Xylem
Yarn
Zadar
Players enter the lottery by buying tickets and choosing three symbols for each ticket. A ticket wins if at least two of the three symbols guessed match the symbols on the tokens drawn from the bag.

What is the minimum number of tickets necessary to guarantee a prize?

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