Self Maths Puzzle Category

3 9 21 x 71 113 so what is the value of x?

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Self Other Question

integration of
2x^12 + 5x^9/(x^5 + x^3 +1) Given that x, y, z, p, q, r are all positive quantities, also xp, yq, zr are distinct. If x,y and z are in A.P; p, q and r are in H.P. and xp, yq, zr are in G.P.; then calculate the value of x : y : z.