There are 10 questions, each question is either True or False. Number of different sequences of ...

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There are 10 questions, each question is either True or False. Number of different sequences of incorrect answers is also equal to
(A) Number of ways in which a normal coin tossed 10 times would fall in a definite order if both Heads and Tails are present.
(B) Number of ways in which a multiple choice question containing 10 alternatives with one or more than one correct alternatives, can be answered.
(C) Number of ways in which it is possible to draw a sum of money with 10 coins of different denominations taken some or all at a time.
(D) Number of different selections of 10 indistinguishable things taken some or all at a time.
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