3/(1*2*3*4)+3/(2*3*4*5)+3/(3*4*5*6)+...+3/(17*18*19*20)=
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3/(1*2*3*4)+3/(2*3*4*5)+3/(3*4*5*6)+...+3/(17*18*19*20)=
3/(1*2*3*4)+3/(2*3*4*5)+3/(3*4*5*6)+...+3/(17*18*19*20)=
3/(1*2*3*4)+3/(2*3*4*5)+3/(3*4*5*6)+...+3/(17*18*19*20)=
1.960602933
0