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A bag contains 12 bals of different colours: 5 red, 4 blue and 3 yellow. What is the probability of not selecting a red ball

The probability of an event not happening is 1 minus the probability of the event happening. Five of the twelve balls are red so the probability of selecting a red ball is 5/12. The probability of not select...
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Answered by Laura D. • Maths tutor
10015 Views

How do I use PQA?

PQA stands for 'point, quote, analysis'. In a literary text, you may be asked to highlight the features which strenghten your essay's argument. To do so, it is best to first: 1) State the point you wish to m...
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Answered by Sophie F. • English tutor
24336 Views

When would I use the conditionnel tense?

The conditionnel is used either as a form of politesse, to express a wish, to express a possibility, or an action completed with a condition.
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Answered by Sophie F. • French tutor
3453 Views

What does Avogadro's number mean?

Avogadro's number is simply used as a way of telling us how much of a substance we have. The number is 6.022 x 10 23 , and if we have that number of particles, we can make it easier by saying we have one mol...
KF
35989 Views

What is Eutrophication? What are the stages of Eutrophication?

Eutrophication is the loss of oxygen in a body of water (e.g. pond or lake). This is usually due to algal bloom caused by artificial fertilisers and other chemicals being washed into the water by rain.The 5 ...
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Answered by Charlotte G. • Biology tutor
44481 Views