N person stand on the circumference of a circle at distinct points. each possible pair of persons, not standing next to each other, sings a two-minute song one pair after the other. if the total time taken for singing is 28 minutes, what is N?
36 identical chairs must be arranged in rows with the same number of chairs in each row. Each row must contain at least three chairs and there must be at least three rows. A row is parallel to the front of the room. How many different arrangements are possible?
from a well shuffled pack of 52 cards, 3 cards are drawn successively , the first being replaced before the second is drawn and the second being replaced before the third is drawn. the probability that the first is black , the second is diamond and the third is ace, is
In a class, there are equal number of boys and girls. Two students are selected for a game. If the probability that the two students are girls is 7/29, then what is the strength of the class?
two squares of size 1*1 are selected one after another from an 8*8 chessboard. The probability that the two squares belong to different rows and different columns, is
15 % of the people eligible to vote are between 18 and 25 years of age. In an election, 75% of those eligible to vote, who are between 18 and 25, actually voted. In that election, the number of persons between 18 and 25, who actually voted was, what percent of those eligible to vote?
a tank of capacity 1000 cubic cm is being filled with water by 3 pipes A,B and C. the areas of cross section of the pipes A, B and C are in the ratio 3:2:4. What is flowing through each of these pipes at a different rate in cm/min. It was found that the time taken to fill the tank, which was initially empty , by the pipes A, B and C individually is 20 minutes, 50 min and 25 min respectively. Find the ratio of the rates of flow of water through the pipes A and C.
And @goutamjena12 is back into action. When we lazy asses have not even initiated the preparations for CGL 14, you are doing it at war scale.
Very impressed from your dedication sir....👍👏🍻
what is the sum of the total surface areas of all the cubes of all the cubes formed when a cuboid of size 5.2 m*13 m*39 m is cut completely into the least possible number of cubes, all of which are identical?
Here I come! 
Foreign trade with Mesopotamia and Bahrain etc. flourished during Indus Valley Civilization.
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The Harappans were the earliest people to produce cotton. T/F?
Guys please suggest the best study material for tier 1 & 2....!!
in a group of 5 boys, the 2nd boy is twice as efficient as the 1st boy. the 3rd boy is twice as efficient as the 2nd boy and so on. All of them working together will take 5 days to complete a job. How much extra time will the 2nd and 4th boys take working together as compared to the 5th boy working alone to complete the same job, approx?
a large water tank gets filled from two pipes T1 and T2. T1 alone can fill it in 50 min, while T2 alone can fill it in one hour. If on any day T2 starts working only after T1 has been used for filling half the tank, then the time taken to fill the tank will be
a tap takes 8 seconds to fill a jar and 6 minutes to fill a drum. rahul has to fill the drum with the jar. first he fills the jar and then brings it to the drum and pours the water into the drum. the time taken to bring the jar from the tap to the drum is 10 seconds. Unfortunately, the jar develops a leak, which can empty the full jar in 40 seconds. What will be the minimum total time required by rahul to fill the drum?
two pipes A and B can fill a tank separately in 20 and 30 hours respectively, while pipe C can empty it in 60 hours. Pipes A and B were kept open simultaneously for 12 hours. When a person reached the tank when it should have been full he observed that pipe C also remained open by mistake for these 12 hours. he immediately closed it. In what time will the tank get full after C is close?
Brother A and B had some savings in the ratio 4:5. They decided to buy a gift for their sister, sharing the cost in the ratio 3:4. After they bought A spent 2/3rd of his amount while B is left with Rs.145.
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there containers X, Y and Z have a capacities of 10 , 20 and 30 litre respectively. X, which is empty is filled with water from Y. Y is then filled with the wine from Z. X is now emptied into Z. The entire operation is repeated. What would be the strength of wine in the container Z?