Official Quant thread for CAT 2013

MBA CAT 2024
3781
@techsurge said:
Q3f(2x-1) = 3x +4 , what is the value of f(1) +f(2)+ f(3)......f(10)a) 130b) 137.5c)145d) 150
137.5
3782
@techsurge is that 137.5
3783

Q3

137.5

sabne nikal hi liya

3784
@techsurge b
3785

Q.3

[image was removed because it was too large]
3786
@Brooklyn said:
ye kaise aaya ?? :/
@Brooklyn said:
ye kaise aaya ?? :/
official solution as below
let ap be a-7d,a-6d,a-5d................,a+6d,a+7d
T5^2 + T11^2 =3
2a^2+18d^2=3
T2*T14= p
a^2- 36d^2 =p
solving 2 equations you get
a^2=(108+18p)/ 90
d^2 = (3-2p )/90
T1*T15 = a^2 -49d^2
116p-39 /90
hence 1st
3787
@techsurge said:
Q3f(2x-1) = 3x +4 , what is the value of f(1) +f(2)+ f(3)......f(10)a) 130b) 137.5c)145d) 150
b) 137.5 ?
3788
@gs4890 said:
Q.3
Take - D
3789
@gs4890 said:
Q.3
n^2-m^2
3790
@gs4890 Q3. c?
3791
@gs4890 said:
Q.3
n2-m2
3792
@gs4890 A i.e. n2-m2?
3793
@gs4890 said:
Q.3
A
3794
@gs4890 n^2 - m^2
3795
@gs4890 said:
Q.3
n^2 - m^2 ?
3796
@deedeedudu said:
n^2-m^2
kaise kiya??
3797
@gs4890 said:
Q.3
A?
I did it by assuming two quadratic equations, is there any better method ?
3798
@Brooklyn said:
kaise kiya??
Take Alpha=2,Bita=1/2,Gaama=3, Delta =1/3
3799
@rachit_28 said:
A? I did it by assuming two quadratic equations, is there any better method ?
wat did u assume??
3800
@gs4890 said:
Q.3
getting in roots..i think D