Six identical cards are placed on a table. Each card has number '1' marked on one side and number '2' marked on its other side. All the six cards are placed in such a manner that the number '1' is on the upper side. In one try, exactly four (neither more nor less) cards are turned upside down. In how many Ieast number of tries can the cards be turned upside down such that all the six cards show number '2' on the upper side?
Maths PYQs from 2014
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Two cars start towards each other, from two places A and B which are at a distance of 160 km. They start at the same time 08 : 10 AM. If the speeds of the cars are km and km per hour respectively, they will meet each other at
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Five persons fire bullets at a target at an interval of 6, 7, 8, 9 and 12 seconds respectively. The number of times they would fire the bullets together at the target in an hour is
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A worker reaches his factory 3 minutes late if his speed from his house to the factory is km/hr. If he walks at a speed of km/hr then he reaches the factory 7 minutes early the distance of the factory from his house is
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A straight line segment is 36 cm long. Points are to be marked on the line from both the end points. From each end, the first point is at a distance of 1 cm from the end, the second point is at a distance of 2 cm from the first point and the third point is at a distance of 3 cm from the second point and so on. If the points on the ends are not counted and the common points are counted a one, what is the number of points?
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Out of a total of 120 musicians in a club, 5% can play all the three instruments, guitar, violin and flute. It so happens that the number of musicians who can play any and only two of the above instruments is 30. The number of musicians who can play guitar alone is 40. What is the total number those who can play violin alone or flute alone?
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With reference to the figure given below number of different routes from S to T without retracing from U and/or V (T is the next node after V), is
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