Write three pairs of prime numbers less than 20 whose sum is a multiple of 5. Class 6
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Write three pairs of prime numbers less than 20 whose sum is a multiple of 5. Class 6
Question 1.
Write three pairs of prime numbers less than 20 whose sum is a multiple of 5. Class 6
Solution:
2 and 3 as 2 + 3 = 5; 3 and 7 as 3 + 7 = 10; 2 and 13 as 2 + 13 = 15.
Question 2.
The numbers 13 and 31 are prime numbers. Both these numbers have same digits 1 and 3. Find such pairs of prime numbers up to 100. Class 6
Solution:
Such pairs of numbers are 17 and 71, 37 and 73; and 79 and 97.
Question 3.
Find seven consecutive composite numbers between 1 and 100. Class 6
Solution:
Seven consecutive composite numbers between 1 and 100 are 90, 91, 92, 93, 94, 95 and 96.