1 If a registration plate for a car consists of three letter

1: If a registration plate for a car consists of three letters (A-Z) and three numbers (0-9), in any arrangement, what is the probability that a registration plate will contain no duplicate letters or numbers?

2: The weather forecaster indicates that there is a 25% chance of rain on Sat- urday and a 25% chance of rain on Sunday. If the probability that it rains on both Saturday and Sunday is 10%, what is the probability that it rains over the weekend?

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