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Let A={2,3,5,7}. For which of the sets, truth value is true?

$\begin {array} {1 1} (A)\;\ni\; x\: \in \: A \: s.t\: x+2 = 6 & \quad (B)\;\forall \: x \: \in \: A,\: x+3\: < 9 \\ (C)\;\forall \: x\: \in \: A,\: x+4\: \geq \: 11 & \quad (D)\;\forall \: x\: \in \: A,\: x\: is\: prime \end {array}$

 

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Ans : (D)
Since 2,3,5,7 are all prime numbers, so it is true
answered Jan 21, 2014 by thanvigandhi_1
 

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