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If $A=\{x:x\in R\:\:and\:\:x\geq 4\}$ and $B=\{x:x\in R\:and\:x< 5\}$, then $A\cap B$ = ?

(A) $(4,5]$
(B) $(4,5)$
(C) $[4,5)$
(D) $[4,5]$
Can you answer this question?

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Ans: $[4,5)$
Because, if $\geq\:\:or\:\:\leq$ comes then use closed bracket [ ].
If < or > comes then use open bracket ( ).
answered May 21, 2013 by rvidyagovindarajan_1

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