B=1+1/2 (1+2)+1/3(1+2+3)+…1/100(1+2+…+100)

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B=1+1/2 (1+2)+1/3(1+2+3)+…1/100(1+2+…+100)

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  2. `B=1+1/2 (1+2)+1/3(1+2+3)+…1/100(1+2+…+100)`

    `B=1+1/2 .3 +1/3 .6+ …+1/100 .5050`

    `B=1+1/2 .2.3 :2+1/3 .3.4:2+…+1/100 .100.101:2`

    `B=2/2 +3/2 +4/2 +…+101/2`

    `B=(2+3+4+…+101)/(2)`

    `B=2575`

     

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