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1
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Which of the following illustrates the commutative property of addition?

A
17 + 4 + 21 = 21 + 21
B
17 + –17 = 0
C
17 + 0 = 17
D
17 + 4 = 4 + 17
2
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Which of the following illustrates the inverse property of addition?

A
17 + 4 + 21 = 21 + 21
B
17 + 4 = 4 + 17
C
17 + 0 = 17
D
17 + –17 = 0

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