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Mrac [35]
2 years ago
6

There are 20 machines at the gym and Manuel wants to perform exercises on 5 different machines while he is there. How many diffe

rent ways can he select the machines to use?
31008

1860480

100

15504
Mathematics
2 answers:
sasho [114]2 years ago
7 0
  • Total machines: 20
  • Required: on 5 <u>different</u> machines

Selection of machines is persons choice and not arranged specifically, thus we will use Combination.

⇒ 20C5

⇒ 20!/5!(20-5)!

⇒ 15504

Brut [27]2 years ago
3 0
  • n=20
  • r=5

Use combination

total ways

\\ \rm\dashrightarrow ^nC_r=\dfrac{n!}{r!(n-r)!}

\\ \rm\dashrightarrow ^{20}C_5

\\ \rm\dashrightarrow \dfrac{20!}{5!15!}

\\ \rm\dashrightarrow \dfrac{20(19)(18)(17)(16)(15!)}{5(4)(3)(2)(15!}

\\ \rm\dashrightarrow 15504

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