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kirza4 [7]
3 years ago
4

How many different 7-letter permutations can be formed from 5 identical H's and two identical T's

Mathematics
1 answer:
KATRIN_1 [288]3 years ago
5 0

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

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