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a rectangle drawn of height 100 sqares and breadth 200 sqares on graph.it is coloured sqare by sqare.from top left corner and moving across in a spiral tuning right whenever a side of a rect or coloured side is reached.which sqaure is coloured or last

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for a real no. x,int(x) denotes integer part of x.int(x) is the largest integer less than or equal to x.int(1,2)=1,int(-2,4)=-3. so the value of int(1/2)+int(1/2+100)+int(1/2+2/100)+....+int(1/2+99/100)= A+B paint 720 boxes in 20 days.B+C paint in 24 days.C+A in 15 days.A works for 4 days,B works for 8 days,C works for 8 days.total no. of boxes painted by them