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A water tank has steps inside it ....

A water tank has steps inside it . A monkey is sitting on the top most step (i.e . The first step).The water level is at the ninth step .

If the number of steps moved down is represented by negative integers and the number of steps moved up by positive integers , represents his moves in part (i) and (ii) by completing the following (a) -3+2-.....=-8 (b) 4-2+.....=8 . In (a) the sum (-8) represents going down by eight steps .So what will the sum 8 in (b) represent?

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