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The absolute difference of the coefficients of x 10 and x 7 in the expansion of 11 2 x 2 1 x 2 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + is equal to

1. 13 3 – 13
2. 11 3 – 11
3. 10 3 – 10
4. 12 3 – 12

Correct answer: 12 3 – 12

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