0 reads0 ratings0 helpful
Which option is not a prime factorisation?
Advertisement
Answer and explanation
Correct answer: (2 \times 21 \times 5)
Step 1: In prime factorisation, every base must be prime. Step 2: (21) is not prime because (21=3 \times 7), so the third option is not prime factorisation. Step 3: Always identify hidden composite numbers in options.
Frequently asked questions
What is the correct answer to this question?
(2 \times 21 \times 5)
Why is this the correct answer?
Step 1: In prime factorisation, every base must be prime. Step 2: (21) is not prime because (21=3 \times 7), so the third option is not prime factorisation. Step 3: Always identify hidden composite numbers in options.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Real Numbers. Topic: Prime Factorisation.
Student feedback
Was this question useful?
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Difficulty
Easy0%
Medium0%
Hard0%
Was the explanation clear?
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
Advertisement