Question

In how many ways can $10$ true-false questions be replied

• A. $20$
• B. $100$
• C. $512$
• D. $1024$

Answer 1

The correct option is A $20$

There are only two possible outcomes

Either question could be true or false

So, for 10 questions, true can be obtained 10 times

or for the same 10 ques., false can be obtained for 10 times

So, 10+10 = 20