Official Quant thread for CAT 2013

@raopradeep said:
there are N men sitting around acircular table at N distinct points . every possible pair of men except the ones sitting adjacent to each other sings a 2 minute song one pair after other. of total time taken is 88 min. find N ?
8
10
9
11

number of pairs in such case n(n-3)/2
so n(n-3)/2=44
n=11
@scrabbler yes, the answer is 4. how did you go about this question? why is the angle on the base 90?

three variables x,y,z have a sum of 30. all three of them are non-negative integers . if any two integers dont have same value and exactly one variable has a value equal or less than three .find number of possible solutiins

98
285
68
294

@veertamizhan said:
@scrabbler yes, the answer is 4. how did you go about this question? why is the angle on the base 90?
One of the sides is double the other and the included angle is 60...to 30-60-90 ban gaya na...:) I happily missed it and drew the figure and then realised ...

regards
scrabbler

@scrabbler you da boss
@raopradeep said:
zada has to distribute 15 choclates among her 5 kids(a,b,c,d,e) . such that "a" gets atleast 3 and at most 5 chocolates .in how many ways she can do this ?49577417435
C(15,3)+C(14,3)+C(13,3)????
but i am getting a very big answer from this...
i)let a gets 3 chocos
so b+c+d+e=12
combinations: C(15,3)
ii)when a gets 4 chocos
so b+c+d+e=11
combinations: C(14,3)
iii)when a gets 5 chocos
so b+c+d+e=10
combinations: C(13,3)

@Jackson1 said:
C(15,3)+C(14,3)+C(13,3)????but i am getting a very big answer from this...i)let a gets 3 chocosso b+c+d+e=12combinations: C(15,3)ii)when a gets 4 chocos so b+c+d+e=11combinations: C(14,3)iii)when a gets 5 chocos so b+c+d+e=10combinations: C(13,3)
bhai oa is 435
solve kar sayad 435 hi aa raha hai

@raopradeep said:
bhai oa is 435
solve kar sayad 435 hi aa raha hai

nah kafi bada number aa raha hai is se to..........
15c3 is bigger than this...

@raopradeep how do u select 0

question says we have to select

its a subset but not selecting 0 is not selection

hope i am right ???

@raopradeep said:
@techsurge 15c0 hoga to 4944 aayega question me bola hai not more than 5 but selecting 0 items doesnt make subset i think
@techsurge said:
@raopradeep how do u select 0question says we have to select its a subset but not selecting 0 is not selection hope i am right ???
me too having that doubt but null set is subset so thats why 4944

@techsurge said:
@raopradeep how do u select 0question says we have to select its a subset but not selecting 0 is not selection hope i am right ???
might be because null set is subset
@raopradeep said:
bhai oa is 435 solve kar sayad 435 hi aa raha hai
bada aa rha hai...mere solution wo cases bhi include hai jab any kid can get 0 chocos also...is there any condition in question that each kid should get atleast 1 chocolate????
@Dexian said:
nah kafi bada number aa raha hai is se to..........15c3 is bigger than this...
i am not getting answer but oa is 435

@Jackson1 said:
bada aa rha hai...mere solution wo cases bhi include hai jab any kid can get 0 chocos also...is there any condition in question that each kid should get atleast 1 chocolate????
questn se pata to nahi chal raha hai waise

@raopradeep option mein bhi to ho ???
@techsurge said:
@raopradeep option mein bhi to ho ???
pata nahi yaar i am not getting

if xy is a 2 digit number andd u,v,x,y are digits then find the number of solutions of the eqtn (xy)^2 =u!+v

2
3
0
5
i am getting one of them is 11 plz find other 2
@raopradeep said:
if xy is a 2 digit number andd u,v,x,y are digits then find the number of solutions of the eqtn (xy)^2 =u!+v
2
3
0
5
i am getting one of them is 11 plz find other 2
27 and 71
@raopradeep said:
three variables x,y,z have a sum of 30. all three of them are non-negative integers . if any two integers dont have same value and exactly one variable has a value equal or less than three .find number of possible solutiins
98
285
68
294

i m getting 84.....
@Dexian said:
i m getting 84.....
m getting 106. share ur approach