Using the Fundamental principles of counting,
total 1680 , strings of length 4 can be formed using the letters "computer" if repetitions are not allowed.
There are many ways to fill the four empty spaces with a four letter code. You must enter 8 letters of the word "computer".
So , total number of characters = 8
4 blanks must be padded with 8 letters and repeated characters are not allowed.
The first digit can be filled in 8 different ways with each of the 8 characters. Now, we can fill the second digit with the remaining seven characters in 7 ways. The third place can be filled with one of the remaining six characters in 6 different ways, and the fourth place with one of the remaining five characters in 5 different ways.
So, Using the principle of multiplication, there are as many possibilities as we need and how they can occupy 4 free places = 8 x 7 x 6 x 5 = 1680
So , 1680 strings of 4 characters from eight characters word "Computer" and character codes are not repeated.
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