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If a ,b ,c ,d in R^+-{1}, then the min...

If `a ,b ,c ,d in R^+-{1},` then the minimum value of `(log)_d a+(log)_b d+(log)_a c+(log)_c b` is (a)`4` (b)`2` (c)`1` (d)none of these``

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CENGAGE PUBLICATION-SEQUENCES AND SERIES-All Questions
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  2. If a ,b ,c are the sides of a triangle, then the minimum value of a/(...

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  3. If a ,b ,c ,d in R^+-{1}, then the minimum value of (log)d a+(log)b ...

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