alleryIf p is a prime and p divides a squared, then p divides:
Aa itself
Ba plus one
Ctwice a
Da cubed
Answer & Solution
Correct answer: A. a itself
1. This follows from unique factorisation.
2. The primes of a squared are the primes of a.
3. So p divides a.
_Source: syllabus Mathematics, Chapter 1, Real Numbers._
Keep practising Number System
Browse all Number System questions for CAT, or explore more Quantitative Aptitude topics.