If the largest angle in a scalene triangle is 75$°$, then the least possible integral value of the smallest angle of the triangle is :

According to the problem :

Hence 180$°$ is the sum of angles in the triangle.

Given that :

The triangle is a scalene triangle, that means all the angles will have different measures.

The largest angle in a triangle is 75$°$

Therefore,

The second largest angle is

75−1=74$°$ (Given that it has to integral value)

Therefore the smallest angle would be 

=180$°$−75$°$−74$°$

=31$°$

Hence the smallest possible angle is 31$°$