Answer:
90 arrangements
Step-by-step explanation:
Since there are no repititions of letters, there are unique 10 letters in total.
THe number of arrangements would be 2 permutation 10. We need the formula for permutation. That is:

Now, n = 10 [total] and r is 2, so we have:

So, there can be 90 arrangements
Answer:
3/5
Step-by-step explanation:
4+6=10
6/10=3/5
You either start studying now or you fake it and guess and get lucky or you cheat