26.8 of Na2SO4 × xH2O gave 12.6 g of water on heating. The value of x in the compound is (M. mass of Na2SO4 = 142)(A) 14 g atoms of nitrogen(B) 0.6 moles of Sg(C) 4 g equivalents of sulphate ions(D) 1.2×1024 chloride ions.

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Sum of series 2[n/2] ! [n/2]!/ n! [2Co-2C2+3C2....+[-1]^n[n+1]2Cn] where n is an even positive integer. Kindly provide solution of this question and how to generalise this. How do we know that which expansion will give this?

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