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if "one alternative" means 2 choices, then here's the answer.
for each question u have 3 choices : option 1 , option 2, or to not select that question.
so for 10 questions u have 3^10 choices.
but u have to select one or more choices . so exclude the case where u do not choose any question.
so answer is 3^10 -1
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Moderation Team
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