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

question 12

Essay

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

---

Definitions:

Demand Curve

A graphic representation showing how the quantity demanded of a good or service varies with its price.

Marginal Cost

The hike in complete costing that comes with the fabrication of an additional unit of a good or service.

Competitive Buyer

A buyer in a market who cannot influence the market price and takes the price as given.

Marginal Expenditure

The rise in expense from obtaining one more unit of a good or service.