If the stack of blocks pictured here looks the same from all four directions, what is the maximum number of blocks that could be used to build it, based on what you can see from this angle?
source: Brain Flexing IQ Tests
source: Brain Flexing IQ Tests
Answer:
19 blocks. There are four layers. From the top down, they could have at maximum 1 block, 4 blocks, 9 blocks, and 5 blocks.
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