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ITMC 2018 Grade 10 National Preliminary set01 Question 14

ITMC · ITMC 2018 Grade 10 National Preliminary set01

Question 14

For propositions $a,b,c$, which choice for $P$ makes $((a\land b)\land(b\to c))\to P$ a tautology?
  1. $\neg b$
  2. $a\land\neg c$
  3. $c\to\neg b$
  4. $\neg a\lor(b\land c)$
  5. $(a\lor c)\land\neg b$