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What are the types of progression?

Answer
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Hint: To answer the type of progression, we should first know what progression and series. The sequence of the variable and numbers is called a series. We know that series are made in symmetry and a progression is formed by series. We can say that a progression is a series that advances in a logical and predictable pattern.

Complete step by step answer:
We know that the progression principle states that there is a perfect level of overload in between a too slow increase or a too rapid increase. There are mainly 3 types of progression:
Arithmetic progression: Arithmetic progression or AP is a sequence of numbers in order in which the difference of any two consecutive numbers is a constant value.
The formula for finding the nth term of an AP is:
an=a+(n1)d,
Where we know that a is the first term, d is the common difference and n=number of terms.
an=nthterm
We can find the sum of the nth term of AP by the formula:
Sn=n2[2a+(n1)d]

Geometric progression: We know that geometric progression or GP is progression of numbers with a constant ratio between each number and the one before. The general form of a geometric progression is of the form;
a,ar,ar2,ar3...
We can calculate the nth term of G.P with the formula:
an=arn1
where a is the first term and r is the ratio between them.
We can calculate the sum of n terms with the formula:
Sn=a(1rn)1r
Sn=a(rn1)r1

Harmonic progression: A harmonic progression (HP) is defined as a sequence of real numbers which is determined by taking the reciprocals of the arithmetic progression that does not contain zero. The formula of the nth term of the Harmonic progression is:
1a+(n1)d,
where a is the first term, d is the common difference and n is the number of terms in AP.
We can also write the above formula as:
1nthtermofthecorrespondingA.P .
Hence these are the different types of A.P.

Note: We should note that the numbers 2,4,6,8 is an arithmetic progression.These are called the Fibonacci numbers. The Fibonacci sequence is a series of numbers where a number is an addition of the last two numbers starting with 0 and 1 . The Fibonacci sequence can be written as:
0,1,1,2,3,5,8,13,21,34,55...
We can write the rule of this expression as:
Xn=Xn1+Xn2
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