UCEED 2015

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UCEED2015Q8·nat·Hard111 attempts

Shown below are three types of interlocking rods. There are total 12 rods, of which 6 are type A, 2 are type B and 4 are type C respectively. What is the maximum length that can be achieved by connecting the rods appropriately?

Keyboards off — use the numpad, just like on exam day.