Yes anon is right. Thank you.

the question could also have been intended as

d^9/d^8 in which case the answer is d

The ds cancel leaving  9/8

Careful Melody!   👽

The only term in the denominator is "d".

$${\frac{{\mathtt{d}}{\mathtt{\,\times\,}}{\mathtt{9}}{\mathtt{\,\times\,}}{\mathtt{8}}}{{\mathtt{d}}}}$$

So the answer = 72.

To explain:-

d9/d8 = d×9÷d×8 = 72

👨