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There are 7 white socks and 4 black socks in a drawer. Two socks are taken out at random without replacement. Work out the probability that the two socks are the same colour

The probability of pulling out two socks of the same colour is n/m*(n-1)/(m-1) where n is the initial number of that type of sock and m is the total number of socks in the drawer. The reason that we take 1 a...
JB
Answered by James B. • Maths tutor
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What causes isostatic rebound?

Isostatic rebound is the uplift and readjustment of the land after a glaciation. During the last glacial maximum, and other ice ages, the weight of the ice sheets pressed down on the land, causing it to sink...
MH
Answered by Martha H. • Geography tutor
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What are the Macroeconomic Effects of Currency Fluctuations?

Currency and the Exchange rate can be a difficult topic to get your head around. I found a little cheat for remembering the different impacts of weaker or stronger currencies : SPICED which stands for Strong...
GC
Answered by Georgia C. • Economics tutor
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How could I write a program to convert Km/h to m/s in python

First we need to know that the conversion factor for km/h to m/s is 3.6km/h=1m/s Next we need to read in a value from the user. This can be done with 'input' function as follows: KMHvalue= input("Enter ...
SW
Answered by Sarah W. • Python tutor
15180 Views

In the presence of ultraviolet light, ethane and chlorine react to give a mixture of products. What are the products of this reaction?

The reaction that is occuring is a substitution reaction as ethan is already a saturated molecule. The ultraviolet light provides the energy needed to break the bonds between hydrogen and carbon in ethane so...
SW
Answered by Sarah W. • Chemistry tutor
48563 Views