TCS Company Numerical Ability Trigonometry

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I bought a certain number of marbles at a rate of 27 marbles for rupees 2 times M,where M is an integer.I divided these marbles into 2 parts of equal numbers,one part of which I sold at the rate of 13 marbles for RS M and the other at the rate of 14 marbles for Rs M.I spent and received an integral no of rupees,but bought the least number of marbles.How many did I buy?
2014 tcs ques- In a single throw with two dice, find the probability that their sum is a multiple of 3 or 4