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Hannah's sweet problem (Edexcel 2015): There are n sweets, 6 are orange, rest of the sweets are yellow. She takes 2 sweets randomly without replacing them and the probability that 2 orange sweets are chosen is 1/3. Show that n^2-n-90 = 0.

Draw a probability tree diagram. For this question, only two branches are required (orange and orange). At the start, there are n sweets in total, 6 are orange, so p(O) = 6/n. On our second pick, there ar...

Answered by Yimin Z. • Maths tutor

5200 Views

How do I prepare for an exam you're not supposed to revise for?

Stay updated - knowing more about the world gives you more things to talk about.

Have an opinion - easier said than done! Try asking yourself WHY you think that.

Answered by Zoe C. • LNAT tutor

1762 Views

Karen got 32 out of 80 in a maths test. She got 38% in an English test. Karen wants to know if she got a higher percentage in maths or in English. Did Karen get a higher percentage in maths or in English?

We are given that Karen got 38% in her English test, so all that's left to do is work out the percentage she achieved in her maths test and then compare it with 38%: We calculate the percentage by taking ...

Answered by Hal C. • Maths tutor

7796 Views

What are the difference types of transport across membranes?

Firstly we need to understand the structure of membranes. Cell membranes are made up of phospholipids. These are molecules with a hydrophilic head (it “likes water”) and hydrophobic tail (which “doesn’t l...

Answered by Felix S. • Biology tutor

4154 Views

How is the subjunctive formed and when is it needed?

The subjunctive mood is an incredibly useful tool, as using it correctly allows you to access the higher bands of marks for Language Complexity both in essays and oral examinations. Simply put, the subjun...

Answered by Dallas C. • French tutor

2031 Views