A small cube with edge of 1 is placed on the top of the bigger cube with edge of 4, so that its base sits completely on top of the bigger cube. What is the total surface area of the solid obtained this way?
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hi 6*4^2+4*1^2=6*16+4=96+4=100
(5*4^2)+(5*1^2)+(4^2)-(1^2)=100
$\displaystyle 6*4^2+5*1^2-1=100$
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