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What is the difference between co prime and prime numbers

Posted by Shikhar Rai 6 years, 8 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 6 years, 8 months ago

Prime numbers: Numbers which have only two factors 1 and the number itself are called prime numbers.

E.g 2 ,3 ,5, 7 ,11 ,13, 17 and so on are all prime numbers.

Of the first 100 numbers 25 are prime numbers.

Only 2 is an even prime number all prime numbers are odd.

Co prime numbers:Numbers which do not have any common factor between them other than one are called coprime numbers.

Two natural numbers( not necessarily Prime) are coprime if their HCF is 1.
For e.g (1,2) , (1,3), (3,4), (3,10), (3,8), (5,6), (17,23)

even two composite numbers can also be Prime. for e.g (16,25), (84,65)

2Thank You

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