self Maths Puzzle

3 persons with odds in favour each are 2:3, 5:1, 5:7. Find the probability that majority of persons is in favour.

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self Other Question

From number 1 to 1666, all 6 replaced by 1 means, How many 1's are there? If 23 books must be placed in a row . In how many ways these books can be arranged such that no two new books are arranged consecutively,,