If two coins are tossed simultaneously, then the probability of getting atleast one head is

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

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

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

4. 1

Lakshmi tosses two coins simultaneously. The probability that she gets atmost one head is

1. 1

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

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

4. $\dfrac{1}{7}$

Event A : The sun will rise from east tomorrow.

Event B : It will rain on Monday.

Event C : February month has 29 days in a leap year.

Which of the above event(s) has probability equal to 1 ?

1. all events A, B and C

2. both events A and B

3. both events B and C

4. both events A and C

A bag contains 3 red and 2 blue marbles. A marble is drawn at random. The probability of drawing a black marble is :

1. 0

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

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

4. $\dfrac{3}{5}$