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[" 4.The coefficient of "x^(15)" in the ...

[" 4.The coefficient of "x^(15)" in the product "],[(1-x)(1-2x)(1-2^(2)x)(1-2^(3)x)....(1-2^(15)x)" is "],[" equal to "],[[" (1) "2^(105)-2^(121)," (2) "2^(121)-2^(105),]]

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