Respuesta :
Answer:
21
Step-by-step explanation:
7! / (5! x 2!) = 42/2 = 21
other explanation:
TTHHHHH THTHHHH THHTHHH THHHTHH THHHHTH THHHHHT ... 6
HTTHHHH HTHTHHH ........................................................................................... 5
HHTTHHH HHTHTHH ............................................................................................4
HHHTTHH HHHTHTH .............................................................................................3
HHHHTTH HHHHTHT .............................................................................................2
HHHHHTT ...................................................................................................................1
6+5+4+3+2+1 = 21
The number of different ways should be 21.
Calculation of no of different ways:
Since there is 7-letter permutations can be formed from 5 identical H's and two identical T's
So,
[tex]= 7! \div (5! \times 2!) \\\\= 42 \div 2[/tex]
= 21
learn more about the letter here: https://brainly.com/question/90568
