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Step-by-step explanation:
1. size of each cube (a) = 10cm
if three joined end to end , the resulting figure will be cuboid.
surface area of cuboid = 2( lb + lh + bh )
l = 10+10+10=30
b=10
h=10
= 2( lb + lh + bh )
= 2 ( 30*10+30*10+10*10 )
= 2 (300+300+100)
2*700
= 1400 cm²
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