This kind of problem belongs to an area of mathematics called combinatorics.
Usually the numbers will be written the other way round (i.e. 8C6), which would mean: 'calculate the number of ways that 6 items could be chosen from 8'.
In this example, 8C6 = 8! / (6! * 2!) = 28.
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How do you find the value in exponets
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to find the value of an expression, you need to
To find the value of an algebraic expression is to evaluate it.
The absolute value of 5 is 5.