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Questions  >>  Olympiad-Math  >>  Class 10
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For what value of $\lambda$ in the equation $x^2+4x+\lambda$ is a perfect square?

$\begin{array}{1 1}(A) \; \lambda=3\\(B)\;\lambda=16 \\(C)\;\lambda=4 \\(D)\;\lambda=\pm 4 \end{array}$

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