HEREDITY
BASICS OF PROBABILITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The letters A, B, C, and D are used to form four-letter passwords for entering a computer file. How many passwords are possible if letters can be repeated?
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4 x 4 x 4 x 4 = 256
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4 x 3 x 2 x 1 = 24
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4 + 4 + 4 + 4 = 16
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4 + 3 + 2 + 1 = 10
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Explanation:
Detailed explanation-1: -Each of these 64 combinations may also end with any of the 4 letters, thus giving a total of 64 x 4 = 256 codes.
Detailed explanation-2: -Answer and Explanation: Thus, 840 4-lettered passwords can be generated.
Detailed explanation-3: -So, for computing the number of possible passwords we have to use permutation. Thus, the number of possible passwords is 3024.
There is 1 question to complete.