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A number lock contains 6 digits. How many different zip codes can be made with the digits 0–9 if repetition of the digits is allowed upto 3 digits from the beginning and the first digit is not 0?(a) 254307(b) 453600(c) 458760(d) 972340The question was posed to me during an online exam.My question is taken from Counting topic in chapter Counting of Discrete Mathematics |
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Answer» The correct option is (b) 453600 |
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