Probability problem Watch

Badges: 4
Report Thread starter 1 week ago
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.

Quick Reply

Attached files
Write a reply...
new posts
My Feed

See more of what you like on
The 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
    Undergraduate Open Day Undergraduate
    Wed, 19 Jun '19
  • University of West London
    Undergraduate Open Day - West London Campus Undergraduate
    Wed, 19 Jun '19
  • University of Warwick
    Undergraduate Open Day Undergraduate
    Fri, 21 Jun '19

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

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

Watched Threads

View All