Yes. That's the definition of a Scalene triangle. If any two of its sides are equal, then it's not a Scalene triangle.
Yes, a scalene's all sides have to be unequal always or it won't be a scalene.
A scalene triangle always has unequal sides, which is part of its definition. If any two sides of a triangle are equal, it cannot be classified as scalene but rather as isosceles or equilateral. Thus, having unequal sides is essential for a triangle to be considered scalene.
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