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1. Four cards with digits 0, 1, 2 and 3 are rearranged in random order. Find...

1. Four cards with digits 0, 1, 2 and 3 are rearranged in random order. Find the probability that the resulting number will be greater than 2020.

2. How many bytes have different first and second digits?

Math   Statistics-And-Probability   
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