1/(1*2 ) + 2/(1*2*3) + 3/(1*2*3*4) + 4/(1*2*3*4*5) + ……8/(1*2*3*4*5*6*7*8*9)=
1/(1*2)+2/(1*2*3)+3/(1*2*3*4)+4/(1*2*3*4*5)+……8/(1*2*3*4*5*6*7*8*9)=...
1/(1*2 ) + 2/(1*2*3) + 3/(1*2*3*4) + 4/(1*2*3*4*5) + ……8/(1*2*3*4*5*6*7*8*9)=
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