IF A,B,C,D AND P ARE DIFF REAL NO. SUCH THAT (A2+B2+C2)P2-2P(AB+BC+CD)+B2+C2+D2<=0 THEN A,B,C,D AREIN
A.P
G.P
H.P
NONE
-
UP 0 DOWN 0 0 3
3 Answers
Manish Shankar
·2008-12-29 00:32:31
(AP-B)2+(BP-C)2+(CP-D)2≤0
is true when
(AP-B)2+(BP-C)2+(CP-D)2=0
AP=B, BP=C, CP=D
so A, B, C, D are in GP