CGL 2012 Tier 2 Preparations and Results

Staff Selection Commission (SSC) SSC - CGL
985
@mickym said:
Spd of boat in still wtr= 8
Airplane drowned in still water
bhai iska shortcut btao
986
@cbiofficer said: a boat goes 30km upstream nd 44km downstream in 10hours. in 13hours 40km upstream nd 55km downstream..find speed of aeroplane in still water..
n plz wid shortcut..
ye aeroplane kaha ye aagya, can u explain d q to me??
987
@sandeepv882 ans is 0. PUT a=1,b=1,c=-2
988
@mickym said:
Spd of boat in still wtr= 8
Airplane drowned in still water
ye kiya kaise?? i cant understand d q!!!
989
@Brooklyn said:
yar simpy take, a=2 ,b=-1,c=-1
n solve
0 naa??
ha bhai mene yhi liya tha bt mujhe method chahiye algebric iske liye....
990

brooklyn bhai itna kho gye kya..ques ki gehrai ko smjho nai toh doob jaoge

991
@Brooklyn said:
ye kiya kaise?? i cant understand d q!!!
arre bhai forgt abt airplane........usse boat mano & thn solve
992
@cbiofficer : ohh!!! it sinks to d bottom :mg: ??
993
@mickym :yea got it!!

@sandeepv882 said:
ha bhai mene yhi liya tha bt mujhe method chahiye algebric iske liye....
yar itna acha nhi hai algebra i knw how solve in b/w 4 options!

994
@mickym said:
Spd of boat in still wtr= 8
Airplane drowned in still water
bhai shortcut btana
995
@sandeepv882
@sandeepv882 said: a+b+c=0.......{1/(b^2+c^2-a^2)}+{1/(c^2+a^2-b^2)}+{1/(a^2+b^2-c^2)}? explain also....
0
996

x=2-(2^1/3)+(2^2/3)......find value of x^3-6x^2+18x+18=?.......simplification ne dimag kharab kar diya.....

997
@cbiofficer said:
bhai shortcut btana
Bro iska shrtcut ye hai
Assume 1/b-s = X
& 1/ b+s = Y

Now solve the eqns for X n Y


998
@cbiofficer said: a boat goes 30km upstream nd 44km downstream in 10hours. in 13hours 40km upstream nd 55km downstream..find speed of aeroplane in still water..
n plz wid shortcut..
30/(b-s) +44/(b+s)=10
40/(b-s)+55/(b+s)=11
now, let 1/(b-s)=p---------(1)
and 1/(b+s)=q................(2)
then 30p+44q=10
40p+55q=11
will have to solve above equations then again for (1) and (2)

It is lengthy though....
999
@sandeepv882 ha bhai mene yhi liya tha bt mujhe method chahiye algebric iske liye....

a+b+c=0, then a+b=-c, then a^2 + b^2 + 2ab = c^2, i.e., a2+b2-c2 = -2ab
similarly, b2+c2-a2 = -2bc and a2+c2-b2 = -2ac
substitute in ques we get -(a+b+c)/2abc equal to 0
1000
@VK_Shukla said:
30/(b-s) +44/(b+s)=10
40/(b-s)+55/(b+s)=11
now, let 1/(b-s)=p---------(1)
and 1/(b+s)=q................(2)
then 30p+44q=10
40p+55q=11
will have to solve above equations then again for (1) and (2)
It is lengthy though....
@cbiofficer said:
bhai shortcut btana
Bro iska shrtcut ye hai
Assume 1/b-s = X
& 1/ b+s = Y

Now solve the eqns for X n Y

1001

Gotta go sumwhr guys,.......see ya latr

1002
@VK_Shukla x=2-(2^1/3)+(2^2/3)......find value of x^3-6x^2+18x+18=?
ye solve karna yaar
1003
@mickym said:
Bro iska shrtcut ye hai
Assume 1/b-s = X
& 1/ b+s = Y
Now solve the eqns for X n Y
x y kya h isme
1004
@cbiofficer said:
x y kya h isme
thse r transformations so tat eqn can easily be solvd
arre yaar solve karoge to u will get

x= 1/5.......=> b-s= 5
y=1/11 => b+s=11
kitna easy ho gya