MYTUTOR SUBJECT ANSWERS

648 views

There are n sweets in a bag. 6 of the sweets are orange. The rest of the sweets are yellow. Hannah takes a sweet from the bag and eats it. Hannah then takes at another sweet. The probability that Hannah eats two orange sweets is 1/3. Show that n²-n-90=0

P(2 orange sweets) = P(orange sweet) * P(orange sweet)

(6/n) * (5/(n-1)) = 1/3

30/(n(n-1)) = 1/3

90 = n(n-1)

90 = n2-n

n2-n-90=0 as required

Tim V. GCSE Psychology tutor, GCSE Physics tutor, GCSE Biology tutor,...

1 year ago

Answered by Tim, a GCSE Maths tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

520 SUBJECT SPECIALISTS

PremiumCharlotte D. GCSE Biology tutor, A Level Biology tutor, GCSE Psycholo...
£22 /hr

Charlotte D.

Degree: Biological Sciences (Bachelors) - Exeter University

Subjects offered:Maths, Physics+ 2 more

Maths
Physics
Chemistry
Biology

“I am a University of Exeter Graduate with a First class Biological Sciences degree. I have a passion for teaching science and maths!”

£30 /hr

Venetia L.

Degree: General Engineering (Masters) - Durham University

Subjects offered:Maths, Further Mathematics

Maths
Further Mathematics

“I study General Engineering at the University of Durham. I have always enjoyed maths and sciences, so hope to help students who share my love for them too!”

£18 /hr

Asha V.

Degree: Civil and Structural Engineering with Architecture (Other) - Sheffield University

Subjects offered:Maths

Maths

“About Me My name is Asha , I’m currently a first year student studying Structural Engineering with Architecture at Sheffield University. My first experience of tutoring was in my first year of college where I volunteered to tutor stu...”

About the author

Tim V. GCSE Psychology tutor, GCSE Physics tutor, GCSE Biology tutor,...

Tim V.

Currently unavailable: for regular students

Degree: Experimental Psychology (Bachelors) - Bristol University

Subjects offered:Maths, Psychology+ 3 more

Maths
Psychology
Physics
Economics
Biology

“I am a first year student at the Univeristy of Bristol, I am currently studying Experimental Psychology. I have always had an interest in the sciences; whether this be pure sciences ( Biology, Chemistry, Physics, Mathematics), or the s...”

MyTutor guarantee

You may also like...

Posts by Tim

Evaluate policies which a UK government could use to control the activities of oligopolists. (25 marks)

There are n sweets in a bag. 6 of the sweets are orange. The rest of the sweets are yellow. Hannah takes a sweet from the bag and eats it. Hannah then takes at another sweet. The probability that Hannah eats two orange sweets is 1/3. Show that n²-n-90=0

Other GCSE Maths questions

Factorise x²+5x+6.

The circle c has equation x^2 + y^2 = 1. The line l has gradient 3 and intercepts the y axis at the point (0, 1). c and l intersect at two points. Find the co-ordinates of these points.

2x + 7 = 13 - 2x. What is the value of x?

simplfy x/3 + x/4

View GCSE Maths tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok