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What Is the Coeﬃcient Of $x ^ { 2 } y ^ { 7 } \text { in } ( x + y ) ^ { 9 } ?$

Question 6

Essay

What is the coeﬃcient of $x ^ { 2 } y ^ { 7 } \text { in } ( x + y ) ^ { 9 } ?$

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