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

2 drops of vinegar & 2 drops ammonia solution or not

draw a labelled diagram of a magnetic relay and explain it's working

Martha is looking to move to a new city to raise her two young children. School quality and crime rates are her two biggest concerns that she will evaluate befo

Which is the best aerobic exercise plan?

Which cytoskeleton protein helps a cell maintain its shape?

Emile began a 200-kilometer (km) journey through the mountains by going west on a straight path. She traveled a full 25 km in the first hour of her trip. Using

Read this excerpt: Kroc's years on the road as a traveling salesman carrying his own order forms and sample books, knocking on doors, facing each new customer a

Justin Gold, founder of the Justin’s brand of organic nut butters, nut butter cups and snack packs, is an entrepreneur at heart. After wondering why peanut butt

what are all the ractants and products of the light reaction

Pinky Bauer, Chief Financial Officer of Harrison Haulers, Inc., suspects irregularities in the payroll system, and orders an inspection of a random sample of vo