ashmaygillingham ashmaygillingham

22-03-2021
Mathematics

contestada

Ethan has 12 coins. There are three 10p coins and nine 20p coins 20p coins. Ethan chooses 3 coins at random. Work out the probability that he takes exactly 50p.

Respuesta :

cwrw238 cwrw238

22-03-2021

Answer:

3/220.

Step-by-step explanation:

To get exactly 50p he must take 2 20p coins and 1 10p coin.

There are 3! /2! = 3 ways of getting this.

Total number of ways of getting any 3 coins form 12 is 12!/9!3!

= 12*11*10 / 3!

= 220.

So the answer is 3/220.

Answer Link

Otras preguntas

What is 4x + 2y = -20 written in slope-intercept form? (Points : 2) y = 2x - 20 y = -4x + 20 y = 20x - 4 y = -2x - 10

Which type of soil holds the most water? A.silt b. clay c. sand d. loam

the hanseatic league was created to?

The first government dealt with the Native American problem by __________________. a. getting an army together and running them off b. not letting any more sett

What is h2o? How is it build?

the molar mass of a compound depends upon the what

Chantal cut an apple into a equal slices. She ate 4 slices and had 4 slices left. Which equation models the problem?

Was the revolution in agriculture necessary to the Industrial Revolution? Explain.

When deciding whether to build a small or large courthouse, a government leader should identify

Are there some elements on the periodic table that hasn't been discovered?