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if 3 dice are rolled, what is the probability that the sum of the 3 numbers will be 10?

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If the sum of reciprocals of two numbers is 1/12 then what are the numbers. Ram wants to visit 5 places like c, b, m, d, k. he will visit atleast 3 places in one trip and c will be visited in every trip. If visiting different places is considered as different trips then how many ways can he go trips.