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If (a) and (b) are coprime, which situation is not possible?

Answer and explanation

Correct answer: Both having 2 as a common factor

Coprime numbers have 1 as their only common factor, so their HCF is 1. If both a and b are divisible by 2, then 2 is a common factor and they cannot be coprime. In contrast, one number may be even and the other odd, such as 2 and 3, which are coprime. Exam tip: For coprime numbers, check that no common factor other than 1 divides both numbers.

Related tags

Number SystemsCoprime NumbersCommon FactorsHcfIrrationality ProofsProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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