A) how many arrangements are there of revisited with vowels not in increasing order—that is, an i before one (or both) of the es? (b) how many arrangements with no consecutive es and no consecutive is? (c) how many arrangements with vowels not in increasing order and no consecutive es and no consecutive is?

Sorry i didn’t know i had

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

If your asking how much altogether for 12 performance the answer will be 98,496.