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Playing with numbers | Playing with numbers Exercise 2.3

Question 14

A list consists of the following pairs of numbers:

(i)51, 53; 55, 57; 59, 61; 63, 65; 67, 69; 71, 73

Categorize them as pairs of

(i)co-primes

(ii)primes

(iii)composites

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(i)Two numbers are said to be co-prime if they do not have a common factor other than 1.

Therefore, all the given pairs of numbers are co-primes.

(ii)A number is called a prime number if it has no factor other than 1 and the number itself.

Therefore, 59, 61; 71, 73 are pairs of prime numbers.

(iii)A number is called a composite number if it has at least one factor other than 1 and the number itself.

Therefore, 55, 57; 63, 65 are pairs of composite numbers.

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subject-cta

Question 14

A list consists of the following pairs of numbers:

(i)51, 53; 55, 57; 59, 61; 63, 65; 67, 69; 71, 73

Categorize them as pairs of

(i)co-primes

(ii)primes

(iii)composites

Looking to do well in your science exam ? Learn from an expert tutor. Book a free class!

(i)Two numbers are said to be co-prime if they do not have a common factor other than 1.

Therefore, all the given pairs of numbers are co-primes.

(ii)A number is called a prime number if it has no factor other than 1 and the number itself.

Therefore, 59, 61; 71, 73 are pairs of prime numbers.

(iii)A number is called a composite number if it has at least one factor other than 1 and the number itself.

Therefore, 55, 57; 63, 65 are pairs of composite numbers.

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta
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