N-2 should be correct

#1

because the series goes … 0,1,1,2,3,5…
hence the fifth term will be "3 "

#2

Hey @Amishi actually it counts from 0
So ,

0th index  = 0
1th index  = 1
2nd index  = 1
3rd index  = 2
4th index  = 3
5th index = 5
#3

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