39ok do u want substitution method?
chalega kya?
If a,b,c,d are in Gp and ax=by=cz=du,then x,y,z,y are in --
A. AP
B. GP
C. HP
D. none of these
-
UP 0 DOWN 0 0 7
7 Answers
39these are standard and simple problems. i think u should be trying yourself and must get without any trouble watso ever.
11@b555-these are damn simple problems.. the problem is my ans is C and d ans given is B... pls try n c what u r getting.
111st tell me what ans u got -- b or c ??
If its B,,koi bhi method chalega
1x,y,z,u are coming in HP
21 = 41/2 = 81/3 = 161/4 (exponents are in HP)
62ax=by=cz=du=k let
Take log
x log a = y log b = z log c = u log d = log k
also do you remembver that if a, b, c and d are in GP
log a, log b, log c, log d are in AP
thus,
x=log k / log a etc are in HP :)