- 3 - 3x < 3 if x belongs to [- 5 - 4 - 3 - 2 - 1 0 1 2 3 4 5]
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Given, X={1,2,3,....,10}
and A={1,2,3,4,5}
Now, A−B={4}
⇒B=A−{4}={1,2,3,4,5}−{4}
={1,2,3,5}
∴X−{4}−B
={1,2,3,...,10}−{4}−{1,2,3,5}
={6,7,8,9,10}
Therefore,number of subsets B of X i.e., {6,7,8,9,10} =2
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