Which of the following is not a prime factorisation?
Explanation opens after your attempt
Correct Answer
C. \(9\times5\)
Step 1
Concept
In prime factorisation, every factor must be prime.
Step 2
Why this answer is correct
In \(9\times5\), 9 is not prime.
Step 3
Exam Tip
If a composite factor appears, break it into prime factors. चरण 1: अभाज्य गुणनखंडन में हर गुणनखंड अभाज्य होना चाहिए। चरण 2: \(9\times5\) में 9 अभाज्य नहीं है। चरण 3: संयुक्त गुणनखंड दिखे तो उसे आगे अभाज्य गुणनखंडों में तोड़ें।
