Problem

Problem

Let f:(e,∞)→Rf:(e,\infty)\rightarrow R be defined by f(x)=ln⁡(ln⁡(ln⁡x))f(x)=\ln(\ln(\ln x)), then (a) ff is one-one but not onto (b) ff is onto but not one-one (c) ff is one-one and onto (d) ff is neither one-one nor onto

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