Three pairs of prime numbers under 20 with sums as multiples of 5 are: (2, 3), (7, 13), and (11, 19). Their sums are 5, 20, and 30, respectively, all divisible by 5.
Class 6 Mathematics Ganita Prakash Prime Time
Class 6 Mathematics Chapter 5 Prime Time question answer
Prime numbers under 20 include 2, 3, 5, 7, 11, 13, 17, and 19. To find pairs whose sums are multiples of 5, consider combinations like (2, 3), (7, 13), and (11, 19). Their sums are 5, 20, and 30, respectively, all divisible by 5. These pairs satisfy the given condition by adhering to both prime and divisibility properties, showing how different primes can combine to yield specific results.
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