Answer:
A series is used only for n taking the values of natural numbers
But a function or an equation is used for all real values of x. It is not necessary that x should be a natural number.
Step-by-step explanation:
The equation is used when domain is all real values
f(x) = 3x+5 is valid for all x real. x can take values as irrational also, negative or fractions.
But in a series, such as 2+3n, we have the restriction for domain n as only the set of all natural numbers
Here n cannot take negative or 0 or fractions or irrational numbers.
Thus the domain is the one which makes the difference of using an equation and a series.
A series is used only for n taking the values of natural numbers
But a function or an equation is used for all real values of x. It is not necessary that x should be a natural number.
