The diagram shows triangle
How many triangles can be formed using the chosen points as vertices?
- 60
- 145
- 205
- 220
Combinatorics, EXT1 A1 SM-Bank 21
Eight points
- How many triangles can be drawn using these points as vertices? (1 mark)
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- How many pairs of triangles can be drawn, where the vertices of each triangle are distinct points? (2 marks)
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Combinatorics, EXT1 A1 SM-Bank 20
How many rectangles, including all squares, can be found in the 4 × 5 grid below, in total? (2 marks)
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Combinatorics, EXT1 A1 2017 HSC 10 MC
Three squares are chosen at random from the 3 × 3 grid below, and a cross is placed in each chosen square.
What is the probability that all three crosses lie in the same row, column or diagonal?
A.
B.
C.
D.