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Question Number 81725 by zainal tanjung last updated on 14/Feb/20

$$\mathrm{If}7\mathrm{points}\mathrm{out}\mathrm{of}12\mathrm{are}\mathrm{in}\mathrm{the}\mathrm{same}$$$$\mathrm{straight}\mathrm{line},\mathrm{then}\mathrm{the}\mathrm{number}\mathrm{of}$$$$\mathrm{triangles}\mathrm{formed}\mathrm{is}$$

Commented by Tony Lin last updated on 14/Feb/20

$$C_3^5+C_2^5{C}_1^7+C_1^5{C}_2^7=185$$

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