Three equal cubes are placed adjacently in a row. Find the ratio of total surface area of the new cuboid to that of the sum of the surface areas of the three cube.
The sum of a two digit number and the number obtained by reversing the digits is 66. if the digit of the number differ by 2,find the number.how many such numbers are there?
A box of 500 electric bulbs contains 25 defective bulbs one bulb is taken out at random from this box what is the probability that it is not a non defective bulb
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