An algorithm starts with a single square and on each of its next iterations adds new squares all around the outside as shown below.
S S S S
S S S S S S S S S
S S S S
n = 1 n = 2 n = 3
How many unit squares will there be after the nth iteration?
Spot the rectangle
The sum of the numbers in the vector
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Toads and Frogs Puzzle 2
Toads and Frogs Puzzle
Penny Distribution Machine
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