A **Fibonacci** series is a series of numbers in which the next number is the sum of the previous two numbers. The first two numbers are 0 and 1. The third number is the sum of the previous two, and so on.

For example, the following is a Fibonacci series: `0, 1, 1, 2, 3, 5 ...`

. If we see the number 5, it is the sum of the previous two numbers, which are 2 and 3.

In this shot, we'll print the first `nth`

terms of the Fibonacci series in Ruby using `while`

loop.

while(counter < n + 1)if(counter <= 1)nextTerm = celsenextTerm = firstTerm + secondTermfirstTerm = secondTermsecondTerm = nextTermendcounter += 1end

Syntax to print the Fibonacci Series in Ruby

`counter`

: This serves as the counter for our loop.

`n`

: This represents the`nth`

number of terms of the Fibonacci series we want to get.

`nextTerm`

: This represents the next term as the series progresses.

`firstTerm`

: This represents the first term of the series as the loop progresses.

`secondTerm`

**:**This represents the second term of the series as the loop progresses.

It prints the first `nth`

terms of a Fibonacci series.

# create a function to get Fibonacii seriesdef getFibonacci(n)firstTerm = 0secondTerm = 1nextTerm = 0counter = 1result = []puts "The first #{n} terms of Fibonacci series are:-"result.push(firstTerm)while(counter <= n + 1)if(counter <= 1)nextTerm = counterelseresult.push(nextTerm)nextTerm = firstTerm + secondTermfirstTerm = secondTermsecondTerm = nextTermendcounter += 1end# print resultsputs result.to_send# create some termsterm1 = 10term2 = 15term3 = 50# get some first nth terms of a Fibonacci seriesgetFibonacci(term1)getFibonacci(term2)getFibonacci(term3)

- Line 2: We create a function called
`getFibonacci()`

, which takes the`nth`

term specified and returns the first`nth`

term of a Fibonacci series.

- Line 27–29
**:**We create some terms**.**That is the`nth`

number of terms of a Fibonacci series**.** - Line 32–34: We invoke the function on the terms and print the results to the console.

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