If A and B are two complementary events then the relation between P(A) and P(B) is :

1. P(A) = P(B)

2. P(A) + P(B) = 0

3. P(A) + P(B) = 1

4. none of these

Out of the vowels of English alphabet, one letter is selected at random. The probability of selecting the letter 'O' is :

1. 1

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

3. $\dfrac{1}{26}$

4. $\dfrac{1}{5}$

If a letter is drawn from the letters of English alphabet, then the probability, that it is a letter of the word 'DELHI' is :

1. $\dfrac{1}{5}$

2. $\dfrac{5}{26}$

3. $\dfrac{1}{26}$

4. $\dfrac{21}{26}$

A card is selected at random from a well-shuffled deck of 52 cards. The probability of it being a face card is :

1. $\dfrac{3}{13}$

2. $\dfrac{4}{13}$

3. $\dfrac{6}{13}$

4. $\dfrac{8}{13}$