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A man is currently 20 yrs older than his oldest son. His oldest son is currently 2 yrs older than his youngest son. 3 yrs from the current time, the product of ages of his sons will be ten more than...

what is the sum of abscissa and ordinate of a point P where all variable chords of the parabola y^2=8x subtend right angle at the origin , are concurrent .

What's the answer to this differential equation if n is the nth derivative? XY^(n+1)=-ny^n

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