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It is an expression used in the context of sequences and refers to a way of expressing any term in the sequence using an index or counter. It is often called the nth term.
A numeric coefficient is simply a number that is being multiplied by something else. For example, in the term: 3a the number 3 is a numeric coefficient of the term "a". This is just a short way of expressing multiplication. That term means the same thing as: 3 × a
A fraction.
720 is an integer, not a fraction and there is no sensible way of expressing it as a fraction.
58 is an integer and so there is no sensible way of expressing it as a fraction.