1/1*2*3+1/2*3*4+...+1/(48*49*50)

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1/1*2*3+1/2*3*4+...+1/(48*49*50)1/1*2*3+1/2*3*4+...+1/(48*49*50)1/1*2*3+1/2*3*4+...+1/(48*49*50)1/(1

1/1*2*3+1/2*3*4+...+1/(48*49*50)
1/1*2*3+1/2*3*4+...+1/(48*49*50)

1/1*2*3+1/2*3*4+...+1/(48*49*50)
1/(1*2*3 ) +1/(2*3*4 ) + ...+ 1/(48*49*50)
=1/2[1/(1*2)-1/(2*3)]+1/2[1/(2*3)-1/(3*4)] + ...+ 1/2[1/(48*49)-1/(49*50)]
=1/2[1/(1*2)-1/(49*50)]
=306/1225