In how many ways can you rearrange CANADA? I'm trying to solve the following question which is in the permutations unit:

In how many ways can all the letters of the word CANADA be arranged if the consonants must always be in the order in which they occur in the word itself?

I have no idea where to start, any hints would be appreciated!
Thanks

Select three out of six positions for the consonants, fill tme in order, then fill the rest with "A"s. So that's $6\choose 3$.
