A.P/G.P/H.P

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

3 Answers

341
Hari Shankar ·

is this a challenge problem or you want to know how to do it?

1
preeti kochar ·

NOT A CHALLENGE

1357
Manish Shankar ·

(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

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