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If f:(0,∞)→(0,∞) satisfy f(xf(y))=x2y2(a∈R),then ∑nr=1−f(r)nCr is |
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Answer» If f:(0,∞)→(0,∞) satisfy f(xf(y))=x2y2(a∈R),then ∑nr=1−f(r)nCr is |
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