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When a rational number is written in lowest form as p/q, what is true about p and q?

Answer and explanation

Correct answer: They are coprime

The governing concept is the lowest or simplest form of a rational number. A rational number is written as p/q with q not equal to zero, and the fraction is in lowest form when p and q have no common factor greater than 1. Equivalently, their highest common factor is 1, so p and q are coprime. Therefore option A is correct. They do not have to be both even; in fact, if both were even, the fraction could be reduced further. They also need not both equal 3, and the denominator cannot be zero because division by zero is undefined. For example, 6/15 is not in lowest form because both terms share 3, whereas 2/5 is in lowest form because 2 and 5 have HCF 1. The signs of the integers do not change this coprime condition.

Related tags

Number-SystemsRational-NumbersCoprimeProof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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