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How to find conditional probability

Take this problem as an example: 5 white socks and 3 black socks are in a drawer. Stefan takes out two socks at random. Work out the probability that Stefan takes out two socks of the same colour without rep...
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Answered by Joseph U. • Maths tutor
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How are the human lungs specialised for gas exchange?

Gas exchange is when oxygen is transferred from the air in the lungs to the blood and carbon dioxide is transferred from the blood to the air in the lungs. It occurs in the alveoli of the lungs.The lungs hav...
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Answered by Anna D. • Biology tutor
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When do I use the subjunctive tense?

It's better to think of the subjunctive as a mood rather than a tense. As a general rule, it is used to express a feeling of uncertainty in a sentence. Here are the main situations where the verb will need t...
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Answered by Jordan O. • Spanish tutor
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When should I use qui/que/ce qui/ce que?

Qui, que, ce qui and ce que are all relative pronouns. This means that they link a noun with a relative clause. Qui and que can be roughly translated as that/which C e qui and ce que work similarly to qui an...
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Answered by Shannon J. • French tutor
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What is a racemic mixture?

To explain a racemic mixture it is firstly necessary to explain what an enantiomer is. Enantiomers are stereoisomers that are non-superimposable mirror images of each other. An enantiomer has no plane of sym...
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Answered by Katie G. • Chemistry tutor
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