12. If repetition of digit is allowed, how many 4-digit numbers can be formed from 0,1,2,3 and 4? a. 600 b. 550 c. 500 d. 450
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Since repetition of digits is allowed, each digit can be any of the four given options (0, 1, 2, or 3). Therefore, there are 4 choices for each digit. Show more…
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