How many sequences contain exactly three heads when you flip a coin five times? my answer was 15 but apparently I am wrong


2
15
10
8
12

2 answers

HHHTT
HTHHT
HTTHH
HHTHT
HHTTH
HTHTH
TTHHH
THTHH
THHTH
THHHT

Can you think of any other sequences?
httth