These are the first four diagrams in a sequence. They are constructed from dots and lines.
(a)[2]
Complete this table.
(b)[1]
Complete this statement. A diagram in this sequence cannot have 51 small squares because ....
(c)[2]
Which diagram has 249 dots?
(d(i))[2]
Find an expression, in terms of $n$, for the number of lines in Diagram $n$.
(d(ii))[1]
Find the number of lines in Diagram 41.
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