: There are 12 points in a plane. If 4 of them are on a straight line and no other three points are on a straight line, then find the difference between the number of triangles and the number of straight lines that can be formed using these points.
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Formal language is less personal than informal language. ... Formal language does not use colloquialisms, contractions or first person pronouns such as 'I' or 'We'. Informal language is more casual and spontaneous. It is used when communicating with friends or family either in writing or in conversation.
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