self Maths Puzzle

what is the value of
(x-a)(x-b).......(x-z)

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self Other Question

A farmer bought 80 kg of potato for Rs 384 and was obliged to sell it at a loss of as much money as he received from selling 16 kg. the selling price kg is A man invests a part of Rs 10000 at 5% and the remainder at 6%. The 5% investment yields annually Rs 76.50 more than the 6% investment. The amount invested at 6% is