Question
What will be the number of permutations of n different
things, taken r at a time, where repeatition is allowed?Solution
The correct answer is C
Pipes ‘A’ and ‘B’ together can fill a tank in 18 hours, while pipe ‘B’ alone can fill it in 36 hours. If pipe ‘C’ takes 12 hours less th...
An inlet pipe can fill a tank in 10 hours, whereas an outlet pipe can empty the same tank in 25 hours. Find the time taken by two such inlet pipes and o...
Two pipes A and B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously, after how much time B should be closed...
Pipe 'A' alone takes 16 minutes to fill half of the empty tank. Pipe 'B' is thrice as efficient as pipe 'A'. Find the percentage of the tank filled by ...
Tap A can fill a tank in 9 hours. Tap B can fill 37.5% part of the same tank in 3 hours, whereas Tap C can alone empty a tank in ‘x’ hours. 2/5 part...
Pipes X and Y can independently fill a tank in 80 minutes and 90 minutes respectively, while pipes X and Z together take 3 hours to fill the same tank. ...
The efficiencies of two inlet pipes, 'P' and 'Q', are in the ratio of 3:5, respectively. When both pipes are open together, the tank is filled in 16 hou...
Pipes 'E' and 'F' can fill a tank in 20 and 25 minutes respectively. Both are opened together. A leak develops after half of the tank is filled, which r...
Pipe ‘A’ fills a tank in 16 hours. Pipe ‘B’ empties the same in 32 hours. If both are opened together, how much time will it take to fill 50% o...
The time taken by pipe B3 alone to fill an empty tank completely is half of the time taken by pipe B1 alone to fill the same tank completely. Pipe B2 al...
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