Algebra-2

Question Analysis
This problem tests the student's ability to use the coefficients from Pascal's Triangle to find specific terms in a binomial expansion.

Key Concept Explanation
Each row in Pascal's Triangle provides the coefficients for the expansion of . The 3th row (for ) is 1, 3, 3, 1, which corresponds to the coefficients of the terms in the expansion of .

Step-by-step Solution
1. Identify the 3th row of Pascal's Triangle: 1, 3, 3, 1
2. Use these coefficients to write the expansion of

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