Q. 3

# Let A = {x : x<a

Here, A={X:XϵN,X is a multiple of 3} and

B={X:XϵN,X is a multiple of 5}.

AB={X:XϵN,X is a multiple of 3} and{X:XϵN,X is a multiple of 5}

={X:XϵN,X is a multiple of 3 and 5}

={X:XϵN,X is a multiple of 3*5=15}

={X:XϵN,X is a multiple of 15}

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