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Home  >>  CBSE XI  >>  Math  >>  Sets
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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} (x) D-B

$\begin{array}{1 1}(A)\;\{5,10,15\}&(B)\;\{5,10,15,20\}\\(C)\;\phi&(D)\;\{4,8,14,16,20\}\end{array} $

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1 Answer

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D={5,10,15,20}
B={4,8,12,16,20}
20 is the only common element of set D & B
$\therefore D-B=\{5,10,15,20\}-\{4,8,12,16,20\}$
$\Rightarrow \{5,10,15\}$
Hence (A) is the correct answer.
answered May 27, 2014 by sreemathi.v
 

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