A question paper had 10 questions. Each question could only be answered as true(T) of 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?

A. 20
B. 40
C. 512
D. 1024

Each question can be answered in 2 ways.

10 Questions can be answered = 2¹⁰= 1024 ways.