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It depends on the situation.
Sometimes we have an equation like:
X - 14 = 7, in which we can solve for the letter (in this case, X, which equals 21).
Sometimes they are intended to be variables:
Y = X3-17X + 4, where the letters may be many numbers, but are restricted when other variables are known.
Other times, letters refer to specific constants:
e = approximately 2.718281828.
pi = approximately 3.141592654.
i = sqrt(-1) and is imaginary.
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To the nearest number what is the mean number of letters per word in this sentence?
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How about 'four' = 4 letters
