Gate Exam

Triangle ABC has angles α,β,γ. What is the maximum value of

[sqrt{tan(α/2)*tan(β/2)+8} + sqrt{tan(β/2)*tan(γ/2)+8} + sqrt{tan(γ/2)*tan(α/2)+8}]^2

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Gate Other Question

A and B are working on a job.A is the builder and B is the demolition man.A takes 20 days to construct a wall completely.B takes 40 days to demolish it completely.How much time do they take to build the wall completely if they work alternatively.If A starts the work the sum of n terms of series 4+44+444+4444+44444+ ......is
(1) (4/81)[10^(n+1)-9n-1]
(2) (4/81)[10^(n-1)-9n-1]
(3) (4/81)[10^(n+1)-9n-10]
(4) (4/81)[10^n-9n-10]