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The diagram below shows a sequence of patterns formed by square tiles.
Observe the above patterns carefully and answer the questions that follow.
(a) Find the total number of tiles used in pattern 7.
(b) Find the number of tiles at the bottom layer in the 29th pattern.
(c) Find the total number of tiles in Pattern 50.
(d) Find the total number of tiles in Pattern 100.
Notes to students: