Using the formula S=2(lb+bh+lh), find S when l=12cm, b=8cm,and h=4 cm.
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If $l,b,h$are the length, breadth and height of a room, then area of 4 walls will be,A. $2\\left( l+b \\right)h$B. $\\left( l+b \\right)h$C. $lbh$D. $2\\left( lb+bh+hl \\right)h$