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The arithmetic explicit formula is a sub n = a sub 1 + d(n-1) The geometric explicit formula is a sub n = a sub 1 (r)^(n-1)
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Clear up mathematic question
Math can be a difficult subject for many people, but there are ways to make it easier.
Subscripts, like superscripts, have many uses. In this case, we have a function, probably with domain the non-negative integers or the positive integers, and F k is an abbreviation for F ( k).