Answer:
1 and 3 are contradictory
Step-by-step explanation:
A triangle is acute if all angles are less than 90
A triangle is isosceles if any two angles are congruent.
A triangle is right if one of the angle is 90.
Hence we see that a triangle is acute has all angles less than 90.
So it cannot be simultaneously right triangle.
Thus we find that 1 and 3 are contradictory.
1 and 2 are not contradictory as two acute triangles can be equal and also third is acute.
2 and 3 are not contradictory since when a right triangle has other two angles as 45, 45 then it is isosceles as well as right.
Answer is 1 and 3 are contradictory.
