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Step-by-step explanation:
when a square of 6 cm is cut out from the 4 corners of a sheet,both the length and width will reduce to 2*6=12cm
therefore,length of box is 42 -12=30cm
width of box is 30-12 =18cm
height of box is 6cm (which is folded up)
the capacity of the box is base areas*height=30*18*6=3240cm sq.
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