Mathematics
A scalene triangle cannot be
an acute-angled triangle
an obtuse-angled triangle
a right-angled triangle
an equilateral triangle
Triangles
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Answer
A scalene triangle has all three sides of different lengths. An equilateral triangle has all three sides equal.
So a scalene triangle cannot be an equilateral triangle (these are mutually exclusive).
Hence, option 4 is the correct option.
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