Answer: Number of distinct letter arrangements can be made from the letters of the word ‘ABBA’: =6
Number of arrangements start with A= 3
Number of arrangements finish with A =3
Explanation:
Given word : ABBA
Total letters = 4
Number of A's = 2
Number of B's = 2
Number of ways to arrange n letters such that
are line ,
are like ,
are like and so on :

So , the number of distinct letter arrangements can be made from the letters of the word ‘ABBA’:

When the word starts with A , then we need to arrange remaining three letters(BBA) :
Then , Number of arrangements start with A =

∴ Number of arrangements start with A =3
Similarly ,
Number of arrangements finish with A =

∴ Number of arrangements finish with A =3