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 answer are possible ?

A question paper had ten questions. Each question could only be answer

1.	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 answer are possible ?
A.	20
B.	40
C.	512
D.	1024
Answer» E.