dillonowu8yy dillonowu8yy

12-07-2021
Mathematics

contestada

There are twenty students in Mr. Smith's class. He chooses two students randomly each day. How many ways can he choose two students?

Respuesta :

mhanifa mhanifa

13-07-2021

Answer:

190

Step-by-step explanation:

This is the combination of 2 out of 20:

20C2 = 20!/18!2! = 20*19/2 = 190 ways

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13-07-2021

We have to find,

The number of ways in which he can choose two students.

Now the 2 out of 20 combination is,

→ 20C2

→ 20!/18!2!

→ 20 × 19/2

→ 10 × 19

→ 190 ways

Hence, there are 190 ways.

Answer Link

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