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Q.

If  A= { prime numbers less than 30}, B=  {natural numbers less than 10}, then  (AB)(BA)=

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a

{11,13,17,19,23,29}

b

AB

c

{1,2,3,4,5,6,7,8,9}

d

ϕ

answer is C.

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Detailed Solution

A={2,3,5,7,11,13,17,19,23,29}

B={1,2,3,4,5,6,7,8,9}

AB={11,13,17,19,23,29}

BA={1,4,6,8,9}

(AB)(BA)={}=ϕ

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