self Maths Puzzle

point O is the circumcenter of the triangle ABC with circumradius 13cm. Let BC=24cm and OD is perpendicular to bc. then the length of OD is

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self Other Question

5,9,16,24,? by selling 9 articles for a rupee, a man incurred a loss fo 4% to make a gain of 44% the number of articles to be sold for a rupee is