SOLUTION: Assume that a password to log onto a computer account is to consist of 2 letters and 2 digits, Determine the number of possible in the case that repetition is permitted as well as

Question 447930: Assume that a password to log onto a computer account is to consist of 2 letters and 2 digits, Determine the number of possible in the case that repetition is permitted as well as not permitted.
Answer by sudhanshu_kmr(1152) (Show Source): You can put this solution on YOUR website!

As i got that firstly 2 letters and then 2 digits..

number of ways when repetition is permitted = 26*26*10*10 = 67600

number of ways when repetition not allowed = 26*25*10*9 = 58500

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