Look at the following pairs of numbers and determine whether they are co-prime or prime :
(i) $8, 9$ (ii) $11, 13$ (iii) $15, 16$ (iv) $64, 65$ (v) $71, 73$

Open in App

Solution

(A) co-prime (since their H.C.F is 1)
(B) Both are prime numbers with difference of 2, So,they are twin prime
(C) co-prime (since their H.C.F is 1)
(D) co-prime (since their H.C.F is 1)
(E) Both are prime numbers with difference of 2, So,they are twin prime

Suggest Corrections

Similar questions

Q. 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

Q. Which of the following pairs are always co-primes?

(i) two prime numbers
(ii) one prime and one composite number
(iii) two composite numbers

Q. Which of the following are pairs of co-primes?
(i) 8, 14
(ii) 4, 5
(iii) 17, 19
(iv) 27, 15

Q. Determine prime factorization of each of the following numbers:

(i) 216
(ii) 420
(iii) 468
(iv) 945
(v) 7325
(vi) 13915

Study the following information and answer the questions given below.
(i) $^{'} P \div Q^{'}$ means 'Q is the father of P'.
(ii) $^{'} P \times Q^{'}$ means 'P is the sister of Q'.
(iii) $^{'} P + Q^{'}$ means 'P is the brother of Q'.
(v) $^{'} P - Q^{'}$ means 'Q is the mother of P'.
Which of the following is/are redundant to answer the above question?

Join BYJU'S Learning Program

Look at the following pairs of numbers and determine whether they are co-prime or prime :(i) 8,9 (ii) 11,13 (iii) 15,16 (iv) 64,65 (v) 71,73

(A) co-prime (since their H.C.F is 1)(B) Both are prime numbers with difference of 2, So,they are twin prime(C) co-prime (since their H.C.F is 1)(D) co-prime (since their H.C.F is 1)(E) Both are prime numbers with difference of 2, So,they are twin prime

Look at the following pairs of numbers and determine whether they are co-prime or prime :
(i) $8, 9$ (ii) $11, 13$ (iii) $15, 16$ (iv) $64, 65$ (v) $71, 73$

(A) co-prime (since their H.C.F is 1)
(B) Both are prime numbers with difference of 2, So,they are twin prime
(C) co-prime (since their H.C.F is 1)
(D) co-prime (since their H.C.F is 1)
(E) Both are prime numbers with difference of 2, So,they are twin prime