

I roll a die four times. In how many outcomes do we have two throws have the same number and the other two something different?
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In how many ways can be select 5 cards from a card pack such that all 4 suits appear?
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I roll a die 4 times. In how many outcomes will each subsequent throw be greater that the previous one?
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Find 3 digit numbers such that product of their digits is a natural number less than 5?
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Find all 3 digit numbers such that sum of their digits is a whole number less than 5?
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