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Which of the following is a composite number?(a) 2(b) 3(c) 9(d) 7I got this question in a national level competition.This intriguing question originated from Real Numbers in division Real Numbers of Mathematics – Class 10

Answer»

Right choice is (c) 9

To explain: A PRIME number has two factors the number itself and 1. In CASE of 9 there are three factors i.e. 3 × 3 × 1. Hence, it is not a prime number.



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