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IKMC 2022 - Grades 11-12 - Set 2 - Self-study Question 9

IKMC · IKMC 2022 - Grades 11-12 - Set 2 - Self-study

Question 9

Nonzero real numbers a, b, c make $-2a^4b^3c^2$ and $3a^3b^5c^{-4}$ have the same sign. Which statement must hold?
  1. $ab>0$
  2. $b<0$
  3. $c>0$
  4. $bc>0$
  5. $a<0$