Consider the letters ABCDE. a. How many strings of length 3 can be formed if we...

Consider the letters ABCDE.

a. How many strings of length 3 can be formed if we allow repetitions (if we allow a letter to be used more than once)?

b. How many strings of length 3 can be formed if we do not allow repetitions (if we allow each letter to be used at most once)?

c. How many strings of length 3 can be formed if the first letter is A and we allow repetitions?

d. How many strings of length 3 can be formed if the first letter is A we do not allow repetitions?

Expert Solution

here 2 terms are used 'repetition is allowed' and another is 'repetition not allowed'

'repetition allowed' means that if we use any letter than we can use it again to fill next place

similarly for 'repetition not allowed' means if we use any letter we cannot use it again to fill any next place .

Colby Messinger answered 5 months ago

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