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Product of sequences. The product operator for the product of a sequence is denoted by the capital Greek letter Pi â (in analogy to the use of the capital Sigma â as summation symbol). The product of a sequence consisting of only one number is just that number itself.
1. Product Research. Product means the goods and services which are sold to the consumers. It includes consumer products and industrial products. Product research studies the individual product. It studies the making and marketing of the product. It studies the colour, size, shape, quality, packaging, brand name and price of the product.