In how many different way can the letters of the word WEDDING be arranged?

Answer: Option B

The given word contains 7 letters which D is taken 2 times.
∴ Required number of ways
$$\begin{array}{rl}& =\frac{7!}{2!}\\ & =\frac{7\times 6\times 5\times 4\times 3\times 2\times 1}{2\times 1}\\ & =2520\end{array}$$