In mathematics, the Fibonacci series or Fibonacci numbers or Fibonacci sequence are the numbers the first two numbers in the Fibonacci sequence are 0 and 1, and each subsequent number is the sum of the previous two.
The integer sequence:1,1,2,3,5,8,13,21 ,34,55 , 89 , 144 …… is a Fibonacci series.
Fn = Fn-1 + Fn-2
Where F0 = 0 and F1 = 1.