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 ) .
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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}
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