Question

Which number does not have a common factor, other than 1 , with other numbers in each group
(a) 5, 10, 15, 20, 21, 30 (b) 6, 12, 24, 25, 30, 36 (c) 7, 14, 21, 28, 35, 40 ;

Answer 1

Answer:

2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,