Explanation:
We know that:Suppose a set of objects has of one kind of object, of a second kind, of a third kind, and, So, on with then the number of distinguishable permutations of the objects is: Given: Three a’s and two b’saaabbTotal number In the set of 5 words has 3 words of one kind and 2 words of the second kind.Therefore, number of different messages that can be represented by three a's and two b's, Hence, the correct option is (D).