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All even numbers except 2 are?
All numbers that are multiples of 2. All numbers that are 2,4,6,8, or end in 2,4,6,8,0.
What is closed under subtraction?
The set of all integers; the set of all rational numbers; the set of all real numbers; the set of all complex numbers. Also their multiples - for example the set of all multiples of 2; the set of all multiples of 2.5; the set of all multiples of sqrt(17); the set of all multiples of 3 + 4i where i is the imaginary square root of -1.
What are the common multiples of 15 and 20?
60 and all its multiples
What do multiples of 5 end in?
All multiples of 5 are numbers ending in either 5 or 0.
What numbers can represent the side lengths of a right triangle?
Any three numbers, a, b, and c, which satisfy the equation a2 + b2 = c2 will form the sides of a right triangle. Some common values are 3, 4, 5 (and all multiples), 5, 12, 13 (and all multiples), and 7, 24, 25 (and all multiples).
