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[" 10The coefficient of "x^(5)" in the e...

[" 10The coefficient of "x^(5)" in the expansion of "(1+x)^(21)+(1+x)^(22)+cdots+(1+x)^(30)],[[" a."^(51)(1_(5)," b."^(9)C_(5)],[" c."^(31)C_(6)-^(2)C_(6)," d."^(30)C_(5)+^(20)C_(5)]]

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