You can form six numbers: 245, 254, 425, 452, 524, and 542. Among these, only 425 and 245 are primes. The others are divisible by 2 or 5, disqualifying them.
Class 6 NCERT Ganita Prakash Chapter 5 Prime Time
class 6 Mathematics Textbook Chapter 5 question answer
Using 2, 4, and 5, the six three-digit permutations are: 245, 254, 425, 452, 524, and 542. Checking their primality:
• 245 is divisible by 5.
• 254 is divisible by 2.
• 425 is divisible by 5.
• 452 is divisible by 2.
• 524 is divisible by 2.
• 542 is divisible by 2.
Thus, none of these numbers are prime. Despite using each digit exactly once, all numbers are divisible by either 2 or 5.
For more NCERT Solutions for Class 6 Math Chapter 5 Prime Time Extra Questions and Answer:
https://www.tiwariacademy.com/ncert-solutions-class-6-maths-ganita-prakash-chapter-5/