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1) the set must consist of distinct (no repetitions) numbers: 0 2 or 2 4 => only 2 numbers can be in the set, because the difference between any two must be the same

1) We have distinct elements with difference between any two elements to be 2. Say if we have 0 and 2, can we have a third number? It can't be 4, since the difference of 0 and 4 is not 2. It can't be 1, or -2, or anything else, either. So we can only have two numbers in the set. Sufficient.

2) The range is 2 with distinct elements. We can have (0,2) or (0,1,2). Can't determine the number of elements in the set. Insufficient.

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