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1x2x3x4x...xnx=1x2x3x4x...xn(n+1)



Răspuns :

 [tex] 1*2*3*...*n*x=1*2*3*...*n(n+1)\\ x=\frac{1*2*3*...*n(n+1)}{1*2*3*...*n}=n+1[/tex]