InterviewSolution
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InterviewSolution
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There is a three-digit password and it is known that each digit can have four values 5,6,7 or 8 . If there is exactly one correct password, how many distinct wrong passwords are there?A. 63B. 80C. 81D. 64 |
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Answer» (i) Each digit of the password can have 4 values, hence first digit can be filled in 4 ways. (ii) Find the number of ways in which remaining digits can be filled. (iv) Use the fundamental principal of counting and find total number of passwords that rae formed. |
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