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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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Explain the formation of a meander in a river.

This process starts with a slight bend in the river. This causes there to be a faster flow of water on the outside bend and slower water on the inside bend. The faster flow of water on the outside bend resul...
LT
Answered by Leo T. • Geography tutor
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What makes a good primary source?

Understanding the usefulness of different sources is important for historians. It is these sources that help them to formulate arguments and provide accurate depictions of the past. There is many ways a sour...
LH
Answered by Luke H. • History tutor
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Outline how nerve impulses are transmitted along a nerve fibre.

1. Sodium (voltage-gated) channels open and Na + diffuse into neuron (down concentration gradient). 2. Inside of neuron becomes positive compared to the outside, so potential is reversed = depolarization. 3....
PW
Answered by Paulina W. • Biology tutor
12838 Views

Explain the process of inhalation

Inhalation is the process of breathing air into the lungs through the nose and mouth. This causes an increase in the volume of air in the lungs, meaning the pressure will decrease. This is acheived using 3 s...
FZ
Answered by Florence Z. • Biology tutor
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