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There are n sweets in a bag, 6 of which are red. The rest of the sweets are blue. Jen removes 1 sweet from the bag. Jen then takes another sweet from the bag. The probability that Hannah takes two red sweets is 1/3. Show that n²-n-90=0.

We know the total number of sweets is n, and that 6 are red. When Jen takes the first sweet, the probability of it being red is [number of red sweets] / [how many there are] = 6/n . For the second sweet, the...
AB
Answered by Amy B. • Maths tutor
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How do I analyse Shakespeare’s language?

When analysing Shakespeare, don’t panic if you don’t understand every word; focus instead on the overall meaning of the text. Ask yourself: What is Shakespeare trying to achieve here? Has he written this pas...
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What is the difference between independent measures design and repeated measures design?

An independent measures design consists of using different participants for each condition of the experiment. The advantage of this is that there are no order effects, which is when participants behave diffe...
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What were the causes of the 1917 Russian Revolution?

1905 saw Bloody Sunday occur when Tsarist Russian Imperial forces massacred protestors angry with famine and feudalism. This resentment continued to fester until February 1917 when in amidst of famine, infla...
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Answered by Labeeb H. • History tutor
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What are the macroeconomic objectives?

Low unemployment (accounting for the natural rate of unemployment) Sustainable economic growth Balance of payments Stable inflation (usually at approximately 2%)
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Answered by Labeeb H. • Economics tutor
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