Question:

What is the number of different messages that can be represented by three a’s and two b’s?

Updated On: May 1, 2024
  • (A) 7
  • (B) 8
  • (C) 9
  • (D) 10
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The Correct Option is D

Solution and Explanation

Explanation:
We know that:Suppose a set of n objects has n1 of one kind of object, n2 of a second kind, n3 of a third kind, and, So, on with n=n1+n2+n3++nk then the number of distinguishable permutations of the n objects is: =n!n1!×n2!×n3!.nk!Given: Three a’s and two b’saaabbTotal number =3+2=5In 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, =5!3!2!=10Hence, the correct option is (D).
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