Correct Option: D

P		X >	a		=		∞	fx(x)dx
			2				a/2

1 =		∞		– bx	+ 1		dx
		a/2		a

=			– b	x2	+ bx		a
			a	2			a/2

=	– b		a2	+ ba +	b		(a/2)2	–	ba
	a		2		a		a		2

= –	ab	+ ab +	ab	–	ab
	a		8		2

=	ab	=	1
	8		8