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Multiple choice

If $P\left( x \right) ={ ax }^{ 2 }+bx+c$ and $Q\left( x \right) =-{ ax }^{ 2 }+dx+c$, $ac\neq 0$, then the equation $P\left( x \right) .Q\left( x \right) =0$ has

  1. Exactly two real roots

  2. Atleast two real roots

  3. Exactly four real roots

  4. No real roots

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