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IMPORTANT
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If A is any set, then Aϕ is

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Important Questions on Operations on Sets; Venn Diagrams

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8th ICSE
IMPORTANT
If ξ=W and A={x|xW and x10}, then A' is
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IMPORTANT
If  ξ=x|xW, x12, A={x|x, a multiple of 3} and B={x|x is multiple of 4}, then AB is
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IMPORTANT
If ξ={all digits in our number system}, A={x|x is prime} and B={x|x is even}, then B-A is
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IMPORTANT
If A and B are two sets such that nA=22, nB=18 and nAB=35, then nAB=
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IMPORTANT
In a town of 840 persons, 450 persons read Hindi, 300 read English and 200 read both. Then the number of person who read neither is
MEDIUM
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IMPORTANT
If ξ=x|xN, x<25 and A={x:x is a composite number}, then find A' in set builder form and also in roster form.
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8th ICSE
IMPORTANT

If ξ={x|xI,-5x5}, A=-5,-3, 0, 3, 5 and B=-4,-2, 0, 2, 4, then find AB and AB.