Turn on thread page Beta
    • Thread Starter

    "I have 7 yoghurts to last the week: 2 strawberry; 2 Peach;3 Raspberry. I select 1 yoghurt each day.
    a) In how many different orders can I eat the yoghurts?
    b) If I select a yoghurt at random each day, what is the probability that I eat the two strawberry ones on consecutive days?"

    I think for part a you do 7(permutation)7, which gives you 5040 . But I'm not sure if that correct or not.

    a) 7!/(3!*2!*2!) = 210
    b) [6!/(3!*1!*2!)]/[7!/(3!*2!*2!)] = 60/210 =2/7
    • Thread Starter

    (Original post by DotCoder)
    a) 7!/(3!*2!*2!) = 210
    b) [6!/(3!*1!*2!)]/[7!/(3!*2!*2!)] = 60/210 =2/7
    Thank you, would you possibly be able to help me with the second question on this post ... https://www.thestudentroom.co.uk/sho....php?t=4990330


students online now


Exam discussions

Find your exam discussion here

Should predicted grades be removed from the uni application process
Help with your A-levels

All the essentials

The adventure begins mug

Student life: what to expect

What it's really like going to uni


Essay expert

Learn to write like a pro with our ultimate essay guide.

Uni match

Uni match

Our tool will help you find the perfect course for you

Study planner

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Study planner

Resources by subject

Everything from mind maps to class notes.

Hands typing

Degrees without fees

Discover more about degree-level apprenticeships.

A student doing homework

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.