Mark the correct alternative in the following:
The number of arrangements of the letters of the word BHARAT taking 3 at a time is
We have, 6 objects {B}, {H}, {A}, {R}, {A}, {T} and there are 2 A's.
So, the words can be formed out of the letters of the word ‘BHARAT’ taking 3 at a time can be done in 2 ways:
Case-1: When all the letters are distinct.
We have, 5 distinct letters, out of which taking three at a time, the number of words that can be formed = 5P3
= 60
Case-2: When 2 A’s are selected.
So, we have, 2A’s and 1 letter is to selected out of the 4 distinct letters, which can be done in = 4P1
= 4 ways.
Now, the 3 letters can be arranged among themselves, but there are 2 A’s, so the number of ways in which arrangement can be done is
So, in this case, total number of words that can be formed
= 12.
The number of arrangements of the letters of the word BHARAT taking 3 at a time is = (60 + 12)
= 72.