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The area of the cardboard needed to make a closed box of size 10 cm $$\times$$ 15 cm $$\times$$ 8 cm will be:
700 $$cm^2$$
350 $$cm^2$$
1000 $$cm^2$$
1390 $$cm^2$$
Total area of the card box i.e six faces of it=2*15*8 + 2*10*15 + 2*8*10=240+300+160=700 sq cmÂ
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