melisavegaospina1 melisavegaospina1
  • 19-08-2020
  • Mathematics
contestada

In how many ways can you select two people from a group of 15 if the order of selection is not important?

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snog
snog snog
  • 19-08-2020

Answer:

105 ways

Step-by-step explanation:

Because the order of selection does not matter, we know that we will be using a combination instead of a permutation.

₁₅Cā‚‚ = 15! / (2! * 13!)

= 15 * 14 * ... * 2 * 1 / 2 * 1 * 13 * 12 * ... * 2 * 1

= 15 * 14 / 2 * 1 (The 13! cancels out)

= 105

Answer Link
jm2769
jm2769 jm2769
  • 19-08-2020

Answer:

105 ways, because the order of selection does not matter, we know that we will be using a combination instead of a permutation.

Answer Link

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