book Maths Puzzle Numerical Ability

ax+b=c;b

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(2y-3)^3 A triangle can be formed having side lengths 4,5,& 8. It is impossible, however, to construct a triangle with sidelengths 4,5 & 10. Using the side lengths 2,3,5,7 & 11, howmany different triangles with exactly 2 equal sides can be formed?