1.

ldots %2B 1/(0.5*3.4) %2B 1/(0.4*2.3) %2B 1/(0.3*1.2) %2B 1/((n %2B 2)*n(n %2B 1))=n(n %2B 3)/((4*((n %2B 1)*(n %2B 2))))

Answer»

n(n+3)/4( n-1)(n+2); 3(3+3)/4(4-1)(4+2)=3(6)/4(3)(6)=18/12(6)=18/72=9/36=3/6



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