$\begin{array}{1 1}(A)\;350\\(B)\;360\\(C)\;370\\(D)\;380\end{array} $

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- $nP_r=\large\frac{n!}{(n-r)!}$

MONDAY has 6 letters

4 letters are taken at a time

Number of words =$6P_4$

$\Rightarrow \large\frac{6!}{(6-4)!}$

$\Rightarrow \large\frac{6!}{2!}$

$\Rightarrow \large\frac{6\times 5\times 4\times 3\times 2\times 1}{2\times 1}$

$\Rightarrow 360$

Hence (B) is the correct answer.

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