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P1 fill a tank in 30hr where as P2 empties the tank in 60 hr. If P1 is opened in the first hour and P2 in the second hour and so on. What is the earliest time in which the tank is filled??

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TCS Other Question

if g[0]=1,g[1]=-1
g[n]=2*g[n-1]-3*g[n-2]
then calculate g[4]
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