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NIELIT 2017 July Scientist B (IT) - Section B: 22

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Let $L$ be a lattice. Then for every $a$ and $b$ in $L$ which one of the following is correct?

  1. $a\lor b = a​\land \:b$
  2. $a\lor(b\lor c)=(a\lor b)\lor c$
  3. $a\lor(b​\land \:c)=a$
  4. $a\lor(b\lor c)=b$
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Associative property for lattices.
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