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A ratio of the 5 th term from the beginning to the 5 th term from the end in the binomial expansion of 10 3 / 1 3 / 1 ) 3 ( 2 1 2 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + is :

1. 3 / 1 ) 6 ( 2 : 1
2. 3 / 1 ) 16 ( 4 : 1
3. 1 : ) 36 ( 2 3 / 1
4. 1 : ) 36 ( 4 3 / 1

Correct answer: 1 : ) 36 ( 4 3 / 1

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