self Maths Puzzle

f(1)=1.6 and f(1)+f(2)+...+f(n) is between 24 and 27 find value of n??

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self Other Question

s and b started playing a game among 3,4,5,6,2 in sequence in decreasing way like 75364.so what is prob of s making bigger than b?? viru dhoni speed is 5:3.started runnig clockwise in a round field.every round is 0.5km .so when viru is meeting dhoni 6th time in race how much distance he covered??