(30, 45): Not co-prime (GCD = 15). (57, 85): Co-prime (GCD = 1). (121, 1331): Not co-prime (GCD = 11). (343, 216): Co-prime (GCD = 1). class 6 Mathematics Textbook Chapter 5 question answer class 6 Mathematics Chapter 5 Prime Time solutions
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Yes. Other primes satisfying the condition are: 5 → 2 × 5 + 1 = 11 (prime). 11 → 2 × 11 + 1 = 23 (prime). 13 → 2 × 13 + 1 = 27 (prime). class 6 Mathematics Textbook ...
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 ...
The numbers 105 and 330 are products of exactly three distinct prime numbers. Their factorizations are: 105 = 3 × 5 × 7, 330 = 2 × 3 × 5 × 11 (distinct count: 3). Class 6 NCERT Ganita Prakash Chapter ...
True. Among primes, only 2 and 3 are consecutive. For all other primes, the next number is either even or divisible by a smaller prime, making it composite. This holds universally for prime numbers. Class 6 NCERT Ganita Prakash Chapter 5 ...