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प्रश्न
Which of the following are pairs of co-primes?
विकल्प
8, 14
4, 5
17, 19
27, 15
उत्तर
4, 5 and 17, 19
Explanation:
(1) Factors of 8: 1, 2, 4, 8
Factors of 14: 1, 2, 7, 14
∴ Common factors of 8 and 14: 1, 2
∴ 8 and 14 are not a pair of co-prime numbers.
(2) Factors of 4: 1, 4
Factors of 5: 1, 5
∴ Common factors of 4 and 5: 1
∴ 4 and 5 are a pair of co-prime numbers.
(3) Factors of 17: 1, 17
Factors of 19: 1, 19
∴ Common factors of 17 and 19: 1
∴ 17 and 19 are a pair of co-prime numbers.
(4) Factors of 27: 1, 3, 9, 27
Factors of 15: 1, 3, 5, 15
∴ Common factors of 27 and 15: 1, 3
∴ 27 and 15 are not a pair of co-prime numbers.
संबंधित प्रश्न
Which number is neither a prime number nor a composite number?
List the prime numbers from 25 to 100 and say how many they are.
Write all the twin prime numbers from 51 to 100.
Write 5 pairs of twin prime numbers from 1 to 50.
Which are the even prime numbers?
The numbers 29 and ________ are twin primes
Give three pairs of prime numbers whose difference is 2.
[Remark: Two prime numbers whose difference is 2 are called twin primes].
