Q1: Find the number of duplicates in an array Arr =[1,2,3,4 ,4,4,5,6,7,8,7,2]

Answer 1

Calculate length of `list` <Arr> minus length of a `set` object created from `list` <Arr>.

Answer 2

Show your attempt please.

Answer 3

This is not a question from sololearn....i just need help with it wanna integrate something into my program