Question 1201550
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Not counting rotations and reflections, there are only two different shapes that can be made by joining three squares 
together. Again not counting rotations and reflections, the number of different shapes that can be made by joining four 
squares together is
a) 3 b) 4 c) 5 d) 6 e) 7
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The post by @mananth has no any relation to the posed question.


Without additional explanations, the meaning of this assignment is dark and unclear.



For complete explanation, see, for example, this site


https://www.mathsisfun.com/geometry/tetromino.html