Question

2. Which of the following are pairs of co-primes? (i) 8, 14 (ii) 4, 5 (iii) 17, 19 (iv) 27, 15 3. List the prime numbers from 25 to 100 and say how many they are. 4. Write all the twin prime numbers from 51 to 100.​

Answer 1

Answer:

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1 is neither a prime number nor a composite number.

Two numbers which have only 1 as a common factor are said to be co-prime or relatively prime or mutually prime numbers.

We can write 17 as 17 × 1 and 19 as 17 × 1.

Hence, 17 and 19 is a pair of co-prime numbers.

There are a total of 16 prime numbers between 25 and 100 which are 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

Answer 2

Answer:

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Step-by-step explanation:

see above answer