1/60=1/(3*4*5)=1/2[(1/3-1/4)-(1/4-1/5)]1/120=1/(4*5*6)=1/2[(1/4-1/5)-(1/5-1/6)]1/210=1/(5*6*7)=1/2[(1/5-1/6)-(1/6-1/7)]1/336=1/(6*7*8)=1/2[(1/6-1/7)-(1/7-1/8)]1/504=1/(7*8*9)=1/2[(1/7-1/8)-(1/8-1/9)]1...