Combined variation is a combination of direct, inverse, and joint variation. For example, the sales of a product may be directly proportional to the amount of money spent on advertising the product, but inversely proportional to the price of the product.
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Combined variation is a combination of direct, inverse, and joint variation. For example, the sales of a product may be directly proportional to the amount of money spent on advertising the product, but inversely proportional to the price of the product.