Question

Write the following in roster and set builder forms.(i) The set of all natural numbers which divide 42.(ii) The set of natural numbers which are less than 10.

Answer 1

Roster form

i)X = {1,2,3,6,7,}

ii)X = {x:x=1,2,3,6,7}

Set builder form

i)X = {1,2,3,4,5,6,7,8,9}

ii)X = {x:x,x=N<10}

Answer 2

Roster form

i)X = {1,2,3,6,7,}

ii)X = {x:x=1,2,3,6,7}

Set builder form

i)X = {1,2,3,4,5,6,7,8,9}

ii)X = {x:x,x=N<10}