Find duplicates in multiple columns criteria

[FlashDota]

Hello I am looking to find duplicates with a three column criteria:

In this case, I want a formula to return TRUE for Channel 1, Video 1, Date 1/1/2000, because it had duplicates for the same row in these 3 different columns

Channel​	Name​	Date​	Result
Channel 1​	Video 1​	1/1/2000​	TRUE
Channel 1​	Video 2​	1/1/2000​	FALSE
Channel 2​	Video 1​	1/1/2000​	FALSE
Channel 1​	Video 1​	1/1/2000​	TRUE

 

[Momentman]

A helper column may be "helpful"

Book1
	A	B	C	D	E
1	Channel	Name	Date	Concat helper column	Result
2	Channel 1	Video 1	1/1/2000	Channel 1Video 11/1/2000	TRUE
3	Channel 1	Video 2	1/1/2000	Channel 1Video 21/1/2000	FALSE
4	Channel 2	Video 1	1/1/2000	Channel 2Video 11/1/2000	FALSE
5	Channel 1	Video 1	1/1/2000	Channel 1Video 11/1/2000	TRUE
Sheet2

Cell Formulas
Range	Formula
D2:D5	D2	=CONCAT(A2:C2)
E2:E5	E2	=COUNTIF($D$2:$D$5,D2)>1