[2-(3-1)-1)-1 - কত?
ক
1
খ
-12
গ
12
ঘ
-1
সঠিক উত্তর: -1
[2 - (3 - 1) - 1] - 1 = [2 - (13) - 1] - 1 = [2 - 3] - 1 = - 11 = - 1