A question paper had ten questions. Each question could only be answered as True `(T)` or False `(F)`. Each candidate

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Q 2483634547.     A question paper had ten questions. Each question
could only be answered as True `(T)` or False `(F)`. Each
candidate answered all the questions. Yet, no two
candidates wrote the answers in an identical sequence.
How many different sequences of answers are
possible?
IAS 2010 Prelims
A

`20`

B

`40`

C

`512`

D

`1024`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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