# Probability problemWatch

Announcements
#1
I was wondering if someone could help me with this question. I am really not sure how I am supposed to do it.

You have three identical pieces of paper.
You write the letter A on one piece of paper, the letter B on another
piece of paper and the letter C on the last piece of paper.
You fold the three pieces of paper twice, thus hiding the three letters.
You also have three envelopes, marked A, B and C.
You randomly put the folded pieces of paper into the envelopes, only
one in each of the three envelopes.
Let X be the number of folded pieces of paper which end up in the
envelope with the same letter.
Calculate the expected value of X.
0
X

new posts
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• Manchester Metropolitan University
Wed, 19 Jun '19
• University of West London
Wed, 19 Jun '19
• University of Warwick
Fri, 21 Jun '19

### Poll

Join the discussion

#### How did your AQA A-level Biology Paper 3 go?

Loved the paper - Feeling positive (207)
14.76%
The paper was reasonable (783)
55.85%
Not feeling great about that exam... (309)
22.04%
It was TERRIBLE (103)
7.35%