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[" 7.In the binomial expansion of "(a-b)...

[" 7.In the binomial expansion of "(a-b)^(n),n>=5," the sum of the "5^(" in ")" and "6^(" th ")" terms is zero.Then alb equals "],[[" (A) "(n-4)/(5)," (B) "(n-5)/(6)," (C) "(5)/(n-4)," (D) "(6)/(n-5)]]

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