5th fibo in this series

why In this question 5th fibo is 5? Why sir started counting from 0 ? Why are we not taking 5th Fibonacci as 3?

@apoorvagupta1 you can do anyway some sites contain starting from 0 or some from 1 no need to worry. if a question comes it will mentioned from where to start. dont forget to hit like and mark resolved if cleared :smiley: