Always: If you add 1 to an odd number you get an even number, If you add a multiple of 10 to a multiple of 5 the answer is a multiple of 5, Sometimes: The sum of three numbers is odd., Multiples of 5 end in a 5, If you add a number to 5 your answer will be bigger than 5, Never: If you add two odd numbers you get an odd number,

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