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In a contest, a participant writes true or false for each of (5) questions. At least (1) answer must be true. How many answer patterns are possible?

Answer and explanation

Correct answer: (31)

Total patterns are (2^5), and the one pattern with all false is removed. For at least conditions, the complement method is often faster.

Related tags

PermutationsCombinationsCounting PrincipleClass 11ExpertFundamental Principle Of CountingPermutations And CombinationsMathematics

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