18. Mr. Absentminded has forgotten his ATM card pin. But he remembers a few things: The number has four digits (eg. 1234 or 9876). All the digits are different. It begins and ends with an odd number and has two even numbers in the middle. 19 and 519 divide it exactly. What is the number which will open the safe?
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the product of two numbers is 10 5/7 , if one of the number is 3 1/3, find the other, by which number 5 5/6 be multiplied to get 3 1/3?
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