Recall the binomial theorem.

1. The binomial expansion of
is

Observe that


When we multiply these by
,
•
and
combine to make 
•
and
combine to make 
and the sum of these terms is

2. The binomial expansion is

We get the
term when
:

Step-by-step explanation:
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About 7
because 5^2+5^2 is 50 and then you take the sq root of 50 which is about 7
When you buy a coffee table or piece of circular furniture
The number of permutations of 8 people taken 6 at a time is given by: