Four coins are tossed at the same time. What is the probability that exactly 3 heads will appear?
Answer

1/16

1/8

1/32

1/4

Question

Four coins are tossed at the same time. What is the probability that exactly 3 heads will appear?
Answer
		
1/16
		
1/8
		
1/32
		
1/4

mrnood · Answer

there are 16 possible outcomes of 4 tosses (2^4)

Write out a table:

HHHH
HHHT
HHTH
...........

Until you have all 16 outcomes

Count how many have exactly 3 heads (call it n)

odds are n/16

surryyy · Answer

is the answer 1/4?

anonymous · Answer

HHHT HHTH HTHH THHH these are the outcomes out of 16

mrnood · Answer

that is not correct

you need to list 16 options

Some will be the same in essence - but write them in order:

HHHH
HHHT
HHTH
HHTT
HTHH.... (see the sequence?)

mrnood · Answer

@tomorrow 
OK sorry - I see you have posted the answers with 3H

Maybe it would be better to let the OP do this to better understand the combinations

mrnood · Answer

you could also reason this without listing:

the tail will be in 1st, 2nd, 3rd OR 4th place

so 4 options for1 tail.....as you said