Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even?

In two throws of a dice, n(S) = (6 x 6) = 36.

Let E = event of getting a sum ={(3, 6), (4, 5), (5, 4), (6, 3)}.

∴ P(E) =	n(E)	=	4	=	1	.
	n(S)		36		9

Here, n(S) = 52.

Let E = event of getting a queen of club or a king of heart.

Then, n(E) = 2.

∴ P(E) =	n(E)	=	2	=	1	.
	n(S)		52		26

Let S be the sample space.

Then, n(S) = 52C2 =	(52 x 51)	= 1326.
	(2 x 1)

Let E = event of getting 1 spade and 1 heart.

∴ n(E)	= number of ways of choosing 1 spade out of 13 and 1 heart out of 13
	= (13C1 x 13C1)
	= (13 x 13)
	= 169.

∴ P(E) =	n(E)	=	169	=	13	.
	n(S)		1326		102

Clearly, there are 52 cards, out of which there are 12 face cards.

∴ P (getting a face card) =	12	=	3	.
	52		13

Clearly, n(S) = (6 x 6) = 36.

Let E = Event that the sum is a prime number.

Then E

= { (1, 1), (1, 2), (1, 4), (1, 6), (2, 1), (2, 3), (2, 5), (3, 2), (3, 4), (4, 1), (4, 3),       (5, 2), (5, 6), (6, 1), (6, 5) }

∴ n(E) = 15.

∴ P(E) =	n(E)	=	15	=	5	.
	n(S)		36		12

Let S be the sample space and E be the event of selecting 1 girl and 2 boys.

Then, n(S)	= Number ways of selecting 3 students out of 25
	= 25C3 `
	= (25 x 24 x 23) (3 x 2 x 1)
	= 2300.

n(E)	= (10C1 x 15C2)
	= [ 10 x (15 x 14) ] (2 x 1)
	= 1050.

∴ P(E) =	n(E)	=	1050	=	21	.
	n(S)		2300		46

Let S be the sample space.

Then, n(S) = 52C2 =	(52 x 51)	= 1326.
	(2 x 1)

Let E = event of getting 2 kings out of 4.

∴ n(E) = 4C2 =	(4 x 3)	= 6.
	(2 x 1)

∴ P(E) =	n(E)	=	6	=	1	.
	n(S)		1326		221

Let number of balls = (6 + 8) = 14.

Number of white balls = 8.

P (drawing a white ball) =	8	=	4	.
	14		7

Total number of balls = (8 + 7 + 6) = 21.

Let E	= event that the ball drawn is neither red nor green
	= event that the ball drawn is blue.

∴ n(E) = 7.

∴ P(E) =	n(E)	=	7	=	1	.
	n(S)		21		3

Here S = {TTT, TTH, THT, HTT, THH, HTH, HHT, HHH}

Let E = event of getting at most two heads.

Then E = {TTT, TTH, THT, HTT, THH, HTH, HHT}.

∴ P(E) =	n(E)	=	7	.
	n(S)		8