official quant thread for cat08

[convivial]

Originally Posted by yudhajeet

Oops.....sorry for the late reply guys...was outta town..
yeah..12 is the right answer..

Amrita hosted a birthday party and invited all her friends and asked them to invite their friends.There are n people in the party.Only Satyam is not known to Amrita.Each pair that does not include Amrita or Satyam has exactly 2 common friends.Also,Satyam knows everyone except Amrita.If only 2 friends can dance at a time,how many dance numbers will be there at the party?

a)3n-7

b)2n+5

c)4n-3

d)none of these



cogito,ergo,sum...........

[Cute.Sid]

Originally Posted by convivial

Amrita hosted a birthday party and invited all her friends and asked them to invite their friends.There are n people in the party.Only Satyam is not known to Amrita.Each pair that does not include Amrita or Satyam has exactly 2 common friends.Also,Satyam knows everyone except Amrita.If only 2 friends can dance at a time,how many dance numbers will be there at the party?

a)3n-7

b)2n+5

c)4n-3

d)none of these



cogito,ergo,sum...........

Looks like a real nice question
My answer is: d none of these


answer is n-2

[theGreenScar]

Originally Posted by convivial

Amrita hosted a birthday party and invited all her friends and asked them to invite their friends.There are n people in the party.Only Satyam is not known to Amrita.Each pair that does not include Amrita or Satyam has exactly 2 common friends.Also,Satyam knows everyone except Amrita.If only 2 friends can dance at a time,how many dance numbers will be there at the party?

a)3n-7

b)2n+5

c)4n-3

d)none of these



cogito,ergo,sum...........

according to me:

ANS: d>none of these

there would be (n-2)/2 definite pairings, hence (n-2)/2 dance numbers because of the condition. However Amr, Sat cant form a pair coz pairing only between friends. so what happens to them?

cheers,
TGS

[Krack_CAT]

Originally Posted by yudhajeet

"Dravid and Sachin each had a certain number of playing marbles. Dravid lost a game to Sachin and had to give Sachin half of his marbles. In the second game, Sachin lost and had to give three-fourths of his marbles to Dravid, who now had thirty marbles. Finally, the two played a third game. Sachin won and acquired some of Dravid?s marbles.At this point, each boy had exactly the number of marbles he had started with, and Dravid had twice as many marbles as Sachin. How many marbles did Sachin has in the beginning?"

Give 24 hrs before posting your answrs to this q..

No one has given detailed solution of the above question. Please do the same...

[Cute.Sid]

Originally Posted by Krack_CAT

No one has given detailed solution of the above question. Please do the same...

At this point, each boy had exactly the number of marbles he had started with, and Dravid had twice as many marbles as Sachin. How many marbles did

Here let marbles with Sachin=x
and with dravid=y=2x

Dravid lost a game to Sachin and had to give Sachin half of his marbles. In the second game, Sachin lost and had to give three-fourths of his marbles to Dravid, who now had thirty marbles

At the end or game1,

dravid= x
sachin=2x


At the end of gamw 2,
sachin=0.5x
dravid=2.5x

now 2.5x=30
thus, x= 30divided by 2.5=12

[bubai376]

Originally Posted by convivial

Amrita hosted a birthday party and invited all her friends and asked them to invite their friends.There are n people in the party.Only Satyam is not known to Amrita.Each pair that does not include Amrita or Satyam has exactly 2 common friends.Also,Satyam knows everyone except Amrita.If only 2 friends can dance at a time,how many dance numbers will be there at the party?

a)3n-7

b)2n+5

c)4n-3

d)none of these



cogito,ergo,sum...........

Whats the answer to this.. i am getting none of these.. but not sure...... please provide the soln too...

[prashant225]

hey guys

25^102/17

Remainder for the same?

Is there any short cut for this sum.Cauz it took me around 4 mins to solve this one today.

And find the numbers between 100 and 400 which are divisible by either 2,3,5 and 7.

regards
prashant

[swati krishnan]

is it b??! can some1 post the solution please?!

[swati krishnan]

is it none of these!!
n-2 seems to be the right answer!

[swati krishnan]

Originally Posted by convivial
Amrita hosted a birthday party and invited all her friends and asked them to invite their friends.There are n people in the party.Only Satyam is not known to Amrita.Each pair that does not include Amrita or Satyam has exactly 2 common friends.Also,Satyam knows everyone except Amrita.If only 2 friends can dance at a time,how many dance numbers will be there at the party?

is it n-2?!!

swati!