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For the reaction $A + 2B$ $\rightleftharpoons$ $C$, the expression for equilibrium constant is

• A
  $\frac{{[A]{{[B]}^2}}}{{[C]}}$
• B
  $\frac{{[A][B]}}{{[C]}}$
• C
  $\frac{{[C]}}{{[A]{{[B]}^2}}}$
• ✓
  $\frac{{[C]}}{{2[B][A]}}$