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# If A={3,6,9,12,15,18,21},B={4,8,12,16,20},C={2,4,6,8,10,12,14,16},D={5,10,15,20} (iv) B-A

$\begin{array}{1 1}(A)\;\{4,8,12,16,20\}&(B)\;\{3,6,9,12,15,18,21\}\\(C)\;\phi&(D)\;\{4,8,16,20\}\end{array}$

Can you answer this question?

A={3,6,9,12,15,18,21},B={4,8,12,16,20}
Here 12 is the only element of set B is common to set A
$B-A=\{4,8,12,16,20\}-\{3,6,9,12,15,18,21\}$
$\Rightarrow \{4,8,16,20\}$
Hence (D) is the correct answer.
answered May 27, 2014