There are four pens: Red, Green, Blue and Purple in a desk drawer of which two pens are selected at random one after the other with replacement. State the sample space and the following events. B: Two pens of the same colour are not selected.

Two fair dice are thrown. State the sample space and write the favourable outcomes for the following events.B: Sum of numbers on two dice is 7.

For any two events A and B in a sample space which of the following is incorrect?

A bag contains 4 red balls, 8 white balls, 5 green balls and 7 black balls all of the same size. One ball is picked up at random from the bag. Complete the following activity to find the probability of the following events. (i) Event A : the ball picked up is black. (ii) Event B : the ball picked up is not green. (iii) Event C : the ball picked up is white. Total number of balls : n(S) =24 n(A) =...... , P(A) = n(A)/n(S)=.....

A bag contains 4 red balls, 8 white balls, 5 green balls and 7 black balls all of the same size. One ball is picked up at random from the bag. Complete the following activity to find the probability of the following events. (i) Event A : the ball picked up is black. (ii) Event B: the ball picked up is not green. (iii) Event C: the ball picked up is white. Total number of balls : n(S) =24 n(B) =...... P(B) = n(B)/n(S)=......

A bag contains 4 red balls, 8 white balls, 5 green balls and 7 black balls all of the same size. One ball is picked up at random from the bag. Complete the following activity to find the probability of the following events. (i) Event A : the ball picked up is black. (ii) Event B: the ball picked up is not green. (iii) Event C: the ball picked up is white. Total number of balls : n(S) =24 n(C) =...... P(C) = n(C)/n(S)=......