CGL 2012 Tier 2 Preparations and Results

Staff Selection Commission (SSC) SSC - CGL
2984
If x= cos^4(y)+ sin^2 (y) , then range of x is:
x = cos^4 + 1-cos^2 = 1-cos^2+cos^4=1-cos^2(1-cos^2)=1-cos^2*sin^2
x=1-sqr(sin2y)/4; x will be max when sin2y=0=>xmax = 1;
x will be min when sin2y=1;xmin=1-1/4 = 3/4
So,range is [3/4,1]
2985
@JS-M : Bhai 2m/s to diya hi hua hai :P
2986
@Brooklyn said:
@JS-M : Bhai 2m/s to diya hi hua hai
to phir horizontal component nikal lete hai...
2987
@JS-M : vahi nikala hai n hence oa= 1 :D
2988

BBi ppl , gud nyt!! mai chala sone


jagane walle jate raho 😁 "mg:
2989
@Brooklyn said: BBi ppl , gud nyt!! mai chala sone
jagane walle jate raho "mg:
gud night buddy........
2991
@lalit5800 said: @JS-M ....BRO IF SIN2Y=-1 HOGA THEN SQURE OF -1 TO 1 HO JAYEGA NA.......THRFR SIN2Y=0
yr wo to sin2y hai .....ya phir sin^2y....
2992

Sorry bhai logo for this abrupt post....But I haven't studied trigonometry...if someone can just elaborate ki kaha se padh lu....and kya kya padh lu :)
Thanks in advance 😃

2995
Brass is an alloy of Cu and Zn. Bronze is of Cu(80%), Zn(4%), Sn(16%). A fussed mass of both has Cu(74%), Zn(16%), Sn(10%). What is the composition of Cu and Zn in Brass ?
2996

A farmer has 945 cows and 2475 sheep. he farms them into flocks keeping cows and sheep separate and having the same number of animals in each flock . If these flocks are as large as possible then the maximum number of animals in each flock and total numbers of flocks required for the purpose respectively




2997
prabhat ordered 4 arrow shirts and some additional park avenue shirts. the price of 1 arrow shirt was twice that of 1 park avenue shirt. when the order was executed it was found that the number of the two brands had been interchanged. the increased the bill by 50%. the ratio of the number of arrow shirts to the number of park avenue shirts in the origial was??
2998

4726 soldiers were divided in two groups for arranging each group in a solid square it was found that there were some excess soldiers in the second group number of rows in the first group was 32 so the minimum number of soldiers in excess in the second group is

2999
@micky0007 said: A farmer has 945 cows and 2475 sheep. he farms them into flocks keeping cows and sheep separate and having the same number of animals in each flock . If these flocks are as large as possible then the maximum number of animals in each flock and total numbers of flocks required for the purpose respectively
@micky0007 total flocks=76..animals=45 ??
3000
@anurag1701 said:
@micky0007 total flocks=76..animals=45 ??

right

explain plz
3001
@mickym said: Brass is an alloy of Cu and Zn. Bronze is of Cu(80%), Zn(4%), Sn(16%). A fussed mass of both has Cu(74%), Zn(16%), Sn(10%). What is the composition of Cu and Zn in Brass ?
72% and 28% ??
3002
@micky0007 said: 4726 soldiers were divided in two groups for arranging each group in a solid square it was found that there were some excess soldiers in the second group number of rows in the first group was 32 so the minimum number of soldiers in excess in the second group is
102
3003
@mickym said:
102
explain plz
3004
@JS-M said:
72% and 28% ??
3005
@micky0007 take HCF of 945 and 2475 ..that will be the maximum number of animals in each flock,that is 45

945/45=21 flocks of cows and 2475/45=45 flocks of sheep is needed
3006
@micky0007 said:
explain plz
Bhai
1st grp has 32^2 = 1024 soldrs
2nd grp has 4726-1024= 3702 soldrs
nearest sqr to this is 3600
hence excess= 3702-3600= 102