7.(10 pts) a) Use the Pascal's Tringle to expand (x+y)? (5 pts) b) Find the coefficient of xy in the expansion of (3x +
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7.(10 pts) a) Use the Pascal's Tringle to expand (x+y)? (5 pts) b) Find the coefficient of xy in the expansion of (3x +
7.(10 pts) a) Use the Pascal's Tringle to expand (x+y)? (5 pts) b) Find the coefficient of xy in the expansion of (3x + 2y)". (5 pts)
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