What is fib? how can explain

Answer 1

it means fibonacci series. 1,1,2,3,5,8,13,21,34,55,89... look carefully if you add two numbers you get the number after them. for example 1+1=2 these are the first three numbers. 1+2=3 2+3=5 3+5=8. 5+8=13 etc.

Answer 2

fibonacci series (for example in rabbit population)