Question

The following problem refers to strings in A, B, ..., Z.

How many three-letter strings are there that begin with J ?

Answer 1

Answer: There are 676 three-letter strings that begin with J .

Step-by-step explanation:

The number of letters in  English Alphabet = 26

If first letter is fixed as J , then the number of ways to make 3 letters strings [repetition is allowed ] is given by :-

$1\times26\times26=676$

(The first place is occupied by J and the rest of the two place has 26 ways of getting any letter)

Now, there are 676 three-letter strings that begin with J .