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i want to know how to prepare for tcs apti from this site?? i am clueless on 1st i have my apti pls guide me someone

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F(x)=f(f(x))=f(x^2)….how many such functions with degree >2 exist ????? a family uses a mixture of a blend of two coffees costing rs.30 and rs.60 respectively . if the family uses only the expensive vareity it will have to spend rs.450 more. the annual consumption of coffee of the family is 20kgs in what ratio the two blends beng used?