[akshaymoon]

Originally Posted by rohit_coep

1. Mother Dairy sells milk packets in boxes of different sizes to its vendors. The vendors are charged Rs. 20 per packet up to 2000 packets in a box. Additions can be made only in a lot size of 200 packets. Each addition of one lot to the box results in a discount of one rupee an all the packets in the box. What should be the maximum size of the box that would maximize the revenue per box for Mother Dairy?

A. 2400 packets
B. 3000 packets
C. 4000 packets
D. None of the above.

2. If n + 2C8 : n – 2P4 = 57 : 16, then n =
A. 20
B. 22
C. 15
D. None of the above

3. A ladder 25 meters long is placed against a wall with its foot 7 meters away from the foot of the wall. How far should the foot be drawn out so that the top of the ladder may come down by half the distance of the total distance if the foot is drawn out?
A. 6 meters
B. 8 meters
C. 8.75 meters
D. None of the above

4. A pole has to be erected on the boundary of a circular park of diameter 13 meters in such a way that the difference of its distances from two diametrically opposite fixed gates A and B on the boundary is 7 metres. The distance of the pole from one of the gates is:
A. 8 metres
B. 8.25 metres
C. 5 metres
D. None of the above

Puys, please provide explanations as well.

Thanks,
Rohit.

this is your answer to P & C question:
n + 2C8 : n – 2P4 = 57 : 16
it is just a simplification of the equation:

(n+2)(n+1)(n)(n-1)(n-2)!/8!((n-6)!) =57/16

(n-2)!/(n-6)!
simplifying we get,
(n+2)(n+1)(n)(n-1)=57*8*7*6*5!/16
simplifying it again we get,
(n+2)(n+1)(n)(n-1)=18*19*20*21
hence n=19
please check...

[jaisriram]

Originally Posted by divishth

They will rotate 2 Times

Can u explain??

[akshaymoon]

Originally Posted by coolraj420

can we compare the three eqns...
so we cud get 3 values of x ...
we can put ths 3 values and get d soln........
i too got 8/3

yes these type of questions are usually solved taking common values of x which satisfy both the functions which is usually obtained by equating the functions (if there are two) .. but in this case we need to find the common value which could satisfy all the three functions....

[crushkiller]

Puys help me out in these 3 Qs
1.Ralli’s has got the order from Switzerland to export 80, 96, 64 and 128 bottle of Rose, Orange, green and Baidam syrup respectively. He wants to send consignment in minimum boxes of capacity of 64 bottles, however boxes should have equal number of different variety of bottles. For the above purpose he can add more bottle. Again boxes can be kept empty by 1 bottle only so as to prevent breakage. How many Baidam syrup can’t be sent?
10,11,12,15


2.Aryan and Nandini are siblings. They participated in two different competition i.e. swimming and wrestling respectively. Aryan participated in swimming and Nandini in wrestling. Both were awarded rank between 1 to 50 (including 1 and 50). What is the probability that difference between their ranks is not more than 10 rank?
Options :9/25 ,17/40,4/10,3/10


3.Points A, B and C are randomly selected on the circumference of a circle. What is the probability of angle ABC being acute?
Options :1/4,3/4,1/2,3/5

[the_fence_crosser]

----snip----

[sohan shetty]

Originally Posted by crushkiller

Puys help me out in these 3 Qs

3.Points A, B and C are randomly selected on the circumference of a circle. What is the probability of angle ABC being acute?
Options :1/4,3/4,1/2,3/5

is it 1/4?

[crushkiller]

Originally Posted by sohan shetty

is it 1/4?

its 3/4 !!!

[electron1212]

This is from puy prep...
PaGaLGuY.com – India's biggest CAT 2009, MBA website Log In
Can anyone please tell me the method. I am not able to understand it. Thanks

[uhhh...]

Originally Posted by crushkiller

3.Points A, B and C are randomly selected on the circumference of a circle. What is the probability of angle ABC being acute?
Options :1/4,3/4,1/2,3/5

i assume there is no frame of reference for the circle.. i.e. only the relative positions of A, B, C matter and neither of A B C coincide... let O be center of circle

<AOB = x1, <BOC = x2.. all angles in radians.. measured anticlock

required set := pi < x1 + x2 < 2pi, 2pi <x1 + x2 < 3pi
universe := 0 <=x1, x2 <= 2pi

so probability assuming uniform distribution = Area (pi < x1 + x2 < 2pi, 2pi <x1 + x2 < 3pi | 0 <=x1, x2 <= 2pi)/ Area (0 <=x1, x2 <= 2pi) = 3/4

edit:

[Ankurb]

Originally Posted by crushkiller

3.Points A, B and C are randomly selected on the circumference of a circle. What is the probability of angle ABC being acute?
Options :1/4,3/4,1/2,3/5

my take:-
let A,B be two diametrically opposite points.
probability will be zero.
If we move arc AB on either side of the diameter, probability of ABC being acute will always be more.
So it will be more than 1/2 for sure.
I'll choose from 3/4 & 3/5.