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. For which of the following ā€˜nā€™ is the number 2^74 + 2^2058 + 2^(2n) a perfect square ?

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A man has 4 childrens,atleast 1 of whom is a girl. Find the probability that he has 3 girls and 1 boy. In a triangle ABC, the lengths of the sides AB and AC are 17.5cm and 9cm. Let D be a point on the line segment BC such that AD is perpendicular to BC. If AD=3cm, then what is the radius (in cm) of the circle circumscribing the triangle?