The number of all the possible selections which a student can make for answering one or more questions out of eight given questions in a paper, when each question has an altrenative, is

The number of all possible selections of one or more questions from 10 given questions, each question having one alternative is

The number of all possible selections of one or more questions from 10 given questions, each question having an alternative is :

The number of all possible selections of one or more questions from 10 given questions, each question having an alternative is :

Prove that a student can attempt one or more questions out of 8 questions in 2^(8)-1 ways.

The number of all possible selections of one or more questions from 10 given questions,each question having an alternative is :

the number of all possible selections of one or more questions from 10 given questions,each having an alternative is :

Assertion (A) : A question paper contains 5 questions each having an alternative. The number of ways that an examinee can answer one or more questions is 242. Reason (R): The number of ways of answering one or more of n questions when each question have an alternative is 3^(n)-1 . The correct answer is