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The browser used by Answers.com is not up to the formatting, but consider 2 to the power 3 to the power 4.

(2 to the power 3) to the power 4 = 8 to the power 4 = 4096

while

2 to the power (3 to the power 4) = 2 to the power 81 = 3.9*10154 (approx).

These two values are not equal and this, therefore, acts as an example showing that exponentiation is not associative.

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Q: Why is exponentiation not an associative operation?
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