Question:
White squares and black squares are used to form figures that follow a pattern. The first three figures are shown below.
How many white squares are used to form Figure 20?
Solution:
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Paper 2 – Q15 [3 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2022/08/P6_SA2_2021_Nan_Hua_Paper2_Q15-Qns.jpg?resize=400%2C260&ssl=1)