If UR = 1 - 1 then the value of U1 + U2 + U3 + U4 + U5 is

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U_R =	1	-	1
	n		n + 1

U₁ =	1	-	1
	1		2

U₂ =	1	-	1
	2		3

U₃ =	1	-	1
	3		4

U₄ =	1	-	1
	4		5

U₅ =	1	-	1
	5		6

∴ U₁ + U₂ + U₃ + U₄ + U₅

= 1 -	1	+	1	-	1	+	1	-	1	+	1	-	1	+	1	-	1
	2		2		3		3		4		4		4		5		6

= 1 -	6	=	6 - 1	=	5
	6		6		6

If U_R =	1	-	1	then the value of U₁ + U₂ + U₃ + U₄ + U₅ is :
	n		n + 1