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If the fourth term in the Binomial expansion of 6 x log 8 x x 2 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + (x > 0) is 20 × 8 7 , then a value of x is :

1. 8 2
2. 8 3
3. 8
4. 8 –2

Correct answer: 8 2

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