How many combinations of 4 different numbers can you make out of the numbers 1 through 50

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The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?

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how many combinations of 4 different numbers can you make out of the numbers 1 through 50?

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