(1) A two-digit number is formed from the digits 0, 1, 2, 3, 4. Repetition of the digit is allowed. Find the probability that the number so formed is (1) a prime number, (2) a multiple of 4, (3) a multiple of 11.
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Milk is centrifuged to separate its cream. Why is it best to use the method of centrifugation to separate cream from milk?
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