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In a examination there are 4 multiple choice questions with 3 options each of which one option is correct answer in how many ways can a student answer such he fails to answer a question

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There;are;3;choices;for;each;question.\*So,;there;are;3;ways;to; answer;a;question.\*Number;of;ways;to;answer;a;question\* Rightarrow 3	imes 3	imes 3	imes 3=81\* Out;of;81;ways;there;is;only ;one;way;which;has;all;the;answers ;correct.\* So, ;Number ;of ;ways ;in ;which; a ;student ;can ;fail; to ;get ;all; answers\*correct= 81-1=80

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Deependra Verma

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