a cuboid of sides 21 cm ,18cm , 14cm.how many cuboid will be needed to form a cube
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volume of the cube of sides21cm,18cm,14cm
=21 x 18 x 14 =(3x7x3x3x2x2x7)cmcube
now prime factor 2 and 7 do not form a triplet
if we multiply the expression by 2x7=14
therefore,14 cubes r needed to form a cube.
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