Question

in how many ways, the letters of the word 'banking' can be arranged?

Answer 1

$<b>Total number of letters-7$

Letters repeating-1(n is two times)

so,

total no. of arrangements is
$\frac{7!}{2!} \\ = \frac{7 \times 6 \times 5 \times 4 \times 3 \times 2}{2} = 360 \times 7 \\ 2520$
We can arrange letter of banking in $\red{\boxed{2520}}$ways.