Book Maths Puzzle

How many possible outcomes are there when five dice are rolled in which at least one dice shows 6?

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Book Other Question

How many 8 digits mobile numbers can be formed if at least one of their digits is repeated and 0 can also start the mobile number? A board meeting of a company is organized in a room for 24 persons along the two sides of a table with 12 chairs in each side. 6 persons wants to sit on a particular side and 3 persons wants to sit on the other side. In how many ways can they be seated?