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9 + (8 + 1) = (9 + 8) + 1
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This is known as the associative property of addition in arithmetic. Where a + (b+c) = (a+b) + c :D
9 + (8 +1) = (9+8) +1 9 + (9) = (17) +1 18=18
jut remember PEMDAS parenthesis, exponents, multiply, divide, add, subtract.
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