The coefficient of $x^{2}y$ in the expression $7x^{2}y - 4xy^{2} + 9$ is

The coefficient of $x^{2}y$ in the expression $7x^{2}y - 4xy^{2} + 9$ is
  1. $7$
  2. $-4$
  3. $9$
  4. $2$

Solution

The numerical factor multiplying $x^{2}y$ is $7$.

Asked in: IMO

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