@incollection{MEM_2022_51_a13,
     author = {Kelevedjiev, Emil},
     title = {Multiple choice questions exam. {Has} the student guessed the answer by chance?},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {172--177},
     year = {2022},
     volume = {51},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2022_51_a13/}
}