(Q). In a certain test, 2⁽ᵏ⁻ᶦ⁾ students gave wrong answers to at least i questions, where i = 1, 2, 3, ………., k & no student gave more than k wrong answers. what is the total number of wrong answers given?
Solution:-
From previous question
total number of wrong answers = a₁ + a₂ + a₃ + …………. + aₖ