Question 20 - Mathematics: Level E Practice Test for the TABE Test

Which of the following is an incorrect arithmetic operation?

\[7 \times 6 = 6 \times 7\]
\[10 + 2 + 8 = 8 + 2 + 10\]
\[4 + 2 = 2 + 4\]
\[4 + 3 \times 7 = 4 \times 3 + 7\]

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