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# Find a positive value of m for which the coefficient of $x^2$ in the expansion of $(1+x)^m$ is $6$

$\begin{array}{1 1}(A)\;3\\(B)\;4\\(C)\;5\\(D)\;6\end{array}$

Toolbox:
• Coefficient of $x^2$ in the expansion of $(1+x)^m$ is $C(m,2)$ .
According to the problem
$C(m,2)=6$