Book Maths Puzzle

In how many ways can a team of 5 persons can be formed out of a total of 10 persons such that two particular persons should not be included in any team?

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Book Other Question

How many triangles can be formed by joining the vertices of an octagon? Sandeep's age after six years will be three-seventh of his father's age. Ten years ago the ratio of their ages was 1 : 5. What is Sandeep's father's age at present?