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The problem 'Make 37' requires you to use10 of any of the numbers 1,3,5,7 to make a total of 37. Note that the numbers are all odd and 37 is also an odd number but you need 10 of the odd numbers to make another odd number. Usually, an odd number added to another odd number equals an even number. Three odd numbers added together equals to an odd number. Four odd numbers added together equals an even number. Five odd numbers added together equals to an odd number. Six odd numbers added together equals an even number and so on. When you get up to ten numbers, you will find that the solution is an even number. 37 is and odd number, not an even number to therefore, the solution to the problem is that it's impossible. You can make 37 with nine of those numbers or eleven of them because nine or eleven odd numbers added together equals to an odd number.