JEE Main & Advanced
Mathematics
Permutations and Combinations
Question Bank
Definition of permutation, Number of permutations with or without repetition, Conditional permutations
question_answer
In how many ways can 10 true-false questions be replied
A)20
B)100
C)512
D)1024
Correct Answer:
D
Solution :
Required number of ways are\[{{2}^{10}}=1024\], because every question may be answered in 2 ways.