GWD 13 Question 22

[tu1208]

When tossed, a certain coin has equal probability of landing on either side. If the coin is tossed 3 times, what is the probability that it will land on the same side each time?

A. 1/8
B. 1/4
C. 1/3
D. 3/8
E. 1/2

Someone please explain to me why the answer is 1/4

Thanks alot!

tom =D

[sandarac]

When tossed, a certain coin has equal probability of landing on either side. If the coin is tossed 3 times, what is the probability that it will land on the same side each time?

A. 1/8
B. 1/4
C. 1/3
D. 3/8
E. 1/2

Someone please explain to me why the answer is 1/4

Thanks alot!

tom =D

正面 機率 1/2 x 1/2 x 1/2 = 1/8
反面 機率 1/2 x 1/2 x 1/2 = 1/8

所以就是 1/8+1/8 = 1/4

[tu1208]

Thanks very much Sandarac

I have one more question about probabilities:

There are 11 women and 9 men in a certain club. If the club is to select a committee of 2 women and 2 men, how many different such committees are possible?

A. 120
B. 720
C. 1,060
D. 1,520
E. 1,980

Please help!

[sandarac]

http://www.formosamba.com/phpBB3/viewtopic.php?t=2358