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What is the basis of 3 ∣ a² ⇒ 3 ∣ a in the proof of √3?

Answer and explanation

Correct answer: 3 is prime

The basis is the prime-divisor property: if a prime p divides x², then p divides x. Here p = 3, so 3 ∣ a² implies 3 ∣ a. This can be seen from prime factorisation. If 3 did not divide a, then no factor 3 would occur in the factorisation of a, and consequently no factor 3 could occur in a², contradicting 3 ∣ a². In the √3 proof, this result permits writing a = 3r; substitution then leads to b² = 3r² and eventually proves 3 ∣ b. Thus the primality of 3 is essential. Options B, C, and D are not assumptions of the proof and do not justify the implication.

Related tags

Number-SystemsPrime-NumbersDivisibilitySqrt3Proof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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