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When using the addition rule in probability, why must we subtract the "intersection" to find the "union" with the Addition Rule?

There is a subtle point to be made here, which comes down to double counting. The addition rule:Pr(A union B) = Pr(A)+Pr(B)-Pr(A intersection B)allows us to work out the probability that either event A or ev...
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Answered by Lewis G. • Maths tutor
30220 Views

How do I find the minimum or maximum of a quadratic function?

Take a general function f(x) = ax²+bx+c First thing to do with every problem is sit back and think a bit: there are usually several ways to solve a problem but one will likely be easier and shorter. In this ...
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Answered by Max V. • Maths tutor
6580 Views

What is the difference between a structured interview and an unstructured interview, and what are the advantages and disadvantages of each?

Structured interviews are used in psychology when carrying out interviews where the questions are predetermined and in a certain order. The order and structure never changes for any participant.The advantage...
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16138 Views

How do you form the simple future tense?

In French, they are three groups of verbs, verbs that end in -er (eg manger), verbs that end in -ir (finir), and verbs that end in -re, -oir, or -ir (faire, pouvoir, or devenir). The verb endings are the sam...
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Answered by Stephanie H. • French tutor
4402 Views

What is the difference between Ionic and Covalant bonding?

Bonding is when two atoms join together; this happens through movements of electrons to help create a full outer shell of electrons. Ionic bonding is when this takes place between a metal and non metal atom....
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Answered by Aishah I. • Chemistry tutor
5016 Views