In a T.V. show, a contestant opt for video call a friend life line to get an answer from three of his friends, named Amar, Akbar and Anthony. The question which he asks from one of his friends has four options. Find the probability that :

(a) Akbar is chosen for the call.

(b) Akbar couldn't give the correct answer.

Which of the following cannot be the probability of an event?

1. 0.7

2. $\dfrac{2}{3}$

3. -1.5

4. 15%

Out of one digit prime numbers, one number is selected at random. The probability of selecting an even number is

1. $\dfrac{1}{2}$

2. $\dfrac{1}{4}$

3. $\dfrac{4}{9}$

4. $\dfrac{2}{5}$

When a die is thrown, the probability of getting an odd number less than 3 is

1. $\dfrac{1}{6}$

2. $\dfrac{1}{3}$

3. $\dfrac{1}{2}$

4. 0