write three pairs of prime numbers less than 20 whose sum is divisible by 5
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Answer:
The pairs of numbers are (7, 13) and (13, 17) and (19, 11)
Solution:
Given that we have to write three pairs of prime numbers less than 20 whose sum is divisible by 5
Let us first list the prime numbers less than 20
A prime number is a whole number greater than 1 whose only factors are 1 and itself
Prime numbers less than 20 are:
2, 3, 5, 7, 11, 13, 17, 19
We have to find pairs of prime numbers in above list whose sum is divisible by 5
Number that are divisible by 5 must end in 5 or 0
7 + 13 = 20 = divisible by 5
13 + 17 = 20 = divisible by 5
19 + 11 = 30 = divisible by 5
Thus the pairs of numbers are (7, 13) and (13, 17) and (19, 11)
hope it helps
tq./.
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