Self Maths Puzzle General Ability

If a number cube is rolled once and a coin is tossed once, what is the probability that the coin will show tails and composite number on the cube?

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Self Other Question

Sum of 2 nos.is 8 and their product is 13.11. Find the nos. There are 18 guests at a dinner party. They have to sit 9 guests on either side of a long table, three particular persons decide to sit on one particular side and two others on the other side. In how many ways can the guests to be seated?