$$\text { What is the coefficient of } x ^ { 7 } y ^ { 12 } \text { in } ( x + y ) ^ { 19 } \text { and in } ( 2 x + 3 y ) ^ { 19 } ?$$

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The Answer of $$\text { What is the coefficient of } x ^ { 7 } y ^ { 12 } \text { in } ( x + y ) ^ { 19 } \text { and in } ( 2 x + 3 y ) ^ { 19 } ?$$

$\text { What is the coefficient of } x ^ { 7 } y ^ { 12 } \text { in } ( x + y ) ^ { 19 } \text { and in } ( 2 x + 3 y ) ^ { 19 } ?$