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=		1	+	1	+	1	+	1	+	1	+	1
		3.5		5.7		7.9		9.11		11.13		13.15

=	1		1	+	1	+	1	+	1	+	1	+	1
	2		3.5		5.7		7.9		9.11		11.13		13.15

=	1		1	+	1	+	1	+	1	+	1	+	1	+	1	+	1	+	1	+	1	+	1	+	1
	2		3		5		5		7		7		9		9		11		11		13		13		15

=	1		1	−	1		=	1		5 − 1
	2		3		15			2		15

=	1	×	4	=	2
	2		15		15

Second Method :

=	1	+	1	+	1	+	1	+	1	+	1
	3.5		5.7		7.9		9.11		11.13		13.15

Here, n = 3 and r = 6

=	1		1	−	1
	2		n		n + 2r

=	1		1	−	1
	2		3		3 + 2 × 6

=	1		1	−	1
	2		3		15

=	1		5 − 1		=	2
	2		15			15