exam Maths Puzzle Numerical Ability

A mystery number less then 20 has factors. Three of its factors are consecutive odd number. What is the number?

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exam Other Question

1-x^2/1+y multiplied by 1-y^2/x+x^2 divided by y^3-y/x^2 Find a counterexample to the statement "The square of a number added to the sum of the number and five is a prime number."