Question

Write in sets in roster form and set builder form :

1. The set of natural numbers less than 21 and divisible by 3.

2. The set of all letters of the word ' MATHEMATICS '

3. The set of integers which lie between - 4 and 4 ( both exclusive ) .​

Answer 1

Answer:

1 A={3,6,9,12,15,18}

A={x:xmultiplies of 3}

2 B={M,A,T,H,E,I,C,S}

B={x:x the letters of the word mathematics}

3. C={-3,-2,-1,0,1,2,3}