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Q. |
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. | 972340 |
Answer» B. 453600 |
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