Infosys Company Numerical Ability Permutation and Combination

Find the number of ways in which four balls can be selected from 4 green and 6 white balls?

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Infosys Other Question

In 6 seconds a light flashes once. In one hour how many times it will flash? A cube is painted black. It is divided into 125 equal cubes. Find the number of cubes, which have at least 2 sides painted black?