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

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$2^{10}$

310

$2^{10} - 1$

$3^{10} - 1$

answer is C.

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Detailed Solution

Since each question can be dealt with in 3 ways

, by,· selecting it or by selecting its alternative or by

rejecting it. Thus, the total number of ways of dealing

with 10 given questions is 310 including a way in which we

reject all the questions

. Hence, the number of all possible selections $= 3^{10} - 1$

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