Which of the following are prime numbers? 241       (ii)  337        (iii)  391     (iii) 571

Which of the following are prime numbers? 241quad (ii) 337quad (iii) 391quad (iii) 571

Which of the following numbers are prime numbers: (i) 179 (ii) 117 (iii) 139

Which of the following numbers are prime numbers: 179 (ii) 117 (iii) 139

Which of the following are prime numbers ? (i) 103 (ii) 137 (iii) 161 (iv) 179 (v) 217 (vi) 277 (vii) 331 (viii) 397

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

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

Which of the following pairs of numbers are co-prime? (i) 25 and 105 " " (ii) 59 and 97 " " (iii) 161 and 192

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

Express each of the following as a sum of two or more primes: 13 (ii) 130 (iii) 180