Question:
Where was Szolem Mandelbrojt educated in Mar, 1919?

Context:
 Szolem Mandelbrojt attended Paris-Sorbonne University - Paris IV from Jan, 1920 to Jan, 1923. 
 Szolem Mandelbrojt attended University of Warsaw from Jan, 1917 to Jan, 1919. 
 Szolem Mandelbrojt attended National University of Kharkiv from Jan, 1919 to Jan, 1920.

Answer:
National University of Kharkiv