A=(1- 1/10 )+(1- 1/40)+(1- 1/88)+…+(1 -1/1120)

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1. `A=(1- 1/10 )+(1- 1/40)+(1- 1/88)+…+(1 -1/1120)`

   `A=1-(1/10+1/40+1/88+…+1/1120)`

   `A=1-(1/{2.5}+1/{5.8}+1/{8.11}+…+1/{32.35})`

   `A=1-[1/3(3/{2.5}+3/{5.8}+3/{8.11}+…+3/{32.35})]`

   `A=1-[1/3(1/2-1/35)]`

   `A=1-11/70`

   `A=59/70`

   $#lam$

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