Let S be a set of all distinct numbers of the form p q , where p, q 1, 2, 3, 4, 5, 6 . What is the cardinality of the set S?

NDA 2016 Mathematics question

Let S be a set of all distinct numbers of the form , where . What is the cardinality of the set S?

Answer: (B)

Count the distinct values of as runs from 1 to 6, keeping only values not seen earlier. : (6 values). : new values (3). :

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Question ID VK-028452