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The first figure takes 5 matchstick squares to​ build, the second takes 13 to​ build, and...

The first figure takes 5 matchstick squares to​ build, the second takes 13 to​ build, and the third takes 21 to​ build, as can be seen by clicking on the icon below. ​(a​) How many matchstick squares will it take to build the 8th ​figure? ​(b​) How many matchstick squares will it take to build the nth​ figure? ​(c​) How many matchsticks will it take to build the nth​ figure?

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