Dear Rinkesh

SInce each question has an alternative so there are 3 ways to answer each of the six questions -

1. 1st Alternative

or

2. 2nd Alternative

or

3. No answer

So there are 3 possiblities for each of the 6 questions. Therefore total no. of ways in which a question paper can be answered = 3*3*3*3*3*3 = 729

But in ur case atleast one question must be answered.

The way in which no answer is given to any of the question comes to 1

So in ur case answer = 729-1 =728

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