A list consists of the following pairs of numbers: 51, 53; 55,57; 59,61; 63,65; 67,69; 71,73 Categorize them as pairs of: co-primes           (ii)   primes         (iii)  composites

Which of the following pairs of numbers is co-prime?

What is the median of the following list of number: 55, 53, 56,59, 61, 69 and 31?

Show that the following pairs are co-primes : 59, 70

What is the median of the following list of numbers : 55,53,56,59,61,69, and 31 ? A. 55 B. 56 C. 59 D. 61

Show that the following pairs are co-prime: 59, 97 (ii) 875, 1859 (iii) 288, 1375

Find which of the following numbers are primes : (i) 87 , (ii) 89, (iii) 63, (iv) 91

Which of the following pairs are always co- primes? two prime numbers one prime and one composite number two composite numbers

Express each of the following odd numbers as the sum of three odd prime numbers . (i) 31, (ii) 35, (iii) 49, (iv) 63

A number consists of two digits whose sum is 10. If the digits of the number are reversed, then the number decreased by 36. Which of the following is/are correct? I. The number is divisible by a composite number. II. The number is a multiple of a prime number.

In each of the following questions, two rows of numbers are given. The resultant number in each row is to be worked out separately based on the following rules and the questions below the rows of numbers are to be answered. The operations of numbers progress from the left to the right. Rules: (i) If an odd number is followed by another composite odd number(a non-prime number), they are to be multiplied (ii) If an even number is followed by an odd number, which is not a perfect square, they are to be added. (iii) If an even number is followed by a number which is the perfect square, the even number is to be subtracted from the perfect square. (iv) If an odd number is followed by a prime odd number, the first number is to be divided by the second number. (v) If an odd number is followed by an even number, the second one is to be subtracted from the first one. 18 37 5 2 m 6 If m is the resultant of the first row, what is the resultant of the second row ? 1) 19 2) 55 3) 78 4) 7 9