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The sum of all rational terms in the expansion of 15 3 1 5 1 5 2 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + is equal to-

1. 3133
2. 633
3. 931
4. 6131

Correct answer: 3133

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