Question

1. Use the roster method to represent the following sets: a) The counting numbers which are multiples of 6 and less than 50. b) {x/xεN and x is a prime factor of 84} c) The set of all natural numbers for which 60/x is a natural number. d) The set of all integers x for which x+6 less than 10.

Answer 1

a) {6,12,18,24,30,36,42,48}

b) {2,3,7}

c) {1,2,3,4,5,6,10,12,15,20,30,60}

d) {3,2,1,0.-1,-2,-3,-4,.......}

Answer 2

a) {6,12,18,24,30,36,42,48}

b) {2,3,7}

c) {1,2,3,4,5,6,10,12,15,20,30,60}

d) {3,2,1,0.-1,-2,-3,-4,.......}