There are 34 balls.In that 33 balls are weighs 5kg each, and one ball weighs 4 kg.Then find minimum number of weighs to found that faulty ball(4kg ball)?
a)2
b)3
c)4
d)5
Recent SYNTEL question.....
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Asked by teja
teja   Dnt knw dude...
7 years ago
uttam kumar barik   syntel result was announced
7 years ago
manish   c will b d ans
step 1: group 34 balls into 2 ..say a and b...where both a and b contain 17 balls each...now measure and find d lighter grp..letz say it as a
step2: now divide d 17 balls of group a into 3....say as c d and e..where c and d contains 8 balls each and e contains 1 ball...now measure c and d..if both r equal then ball in grp
e is lightest....end...if both r not equal then goto next step.
step3: now lets say...c is d lighter group...then divide 8 balls in c into 3 grps....i=3,j=3,k=2..measure i and j..if i and j are equal then any 1 ball in grp k is lighter...measure 1-1 ball frm k..nd find d lightest one...so 4 weighings r required.
if they r not equal say ith is lighter than jth...that means lighter ball is in ith grp...so measure 1-1 ball frm ith if equal then 3rd ball frm ith grp is lighter or if they r not equal...then either of them r equal..so all 2gthr maximum 4 weighings r required in any case.
7 years ago
VIGNESH.R   how to see the syntel result?
7 years ago
teja   results will sent to your college T.P.O sir within 72 hours from the time of exam...
7 years ago
VIGNESH.R   ok k..
7 years ago
TAPASH PAUL   5 WILL BE
7 years ago
Alok Jaiswal   Ans, (C) 4 in worst case
Manish is right.
7 years ago
Amitabh   Ans (c) as it goes in the power of 3^4=81 as 34 is greater than 27 so we have to take 81
divide the entire balls in the multiple of 3 which leaves 1 ball. Now we take weight of first two group if they are
equal then defected ball is in remaining ones else it is in the the side of minimum weight side of balance and so on...
7 years ago
viprav   min means d bst case
which can b as
17 vs 17
whch provided d fault grp
thn 8 vs 8 n 1 alone n bst case means 8vs 8 is balanced.
so ans can b 2
7 years ago
bharath   hai friends any one through syntel written test
7 years ago
bharath   hai friends any one through out syntel written test
7 years ago
Akshay Srivastav   I think its 4
7 years ago
vilas   dude 1st write the question correctly. Improve ur english...
6 years ago
vilas   If u need the min. no. of balls required, then the answer is 'a'
6 years ago
amit prasad   c is the ans in any case... divide the balls into 3 parts -(11,11,12) now compare (11,11) n keep 12 outside now after 1st balance we came to know which one contains the odd ball now if its 12 then make pair(4,4,4) n if its 11 make pair(4,4,3) n compare (4,4) if 3 contains the odd ball we get our result in 3 then we able identify odd ball in 3 steps but if the odd ball is in 4 then make pair (1,1,2) n then after if 1 case when the odd ball lies in 2 we have to make one more comparision (1,1) so max 4 weighs required in worst case so ans is c
6 years ago
Ashutosh Das   it's c
6 years ago
Rohit Kumar Singh   c
6 years ago
kamruddin ansari   a) 2 explanation:
1. put 17 balls on each pan of scale which pan lift up take those ball out.
2. now again put 8 balls out of 17 balls on each pan of scale if both pan balance the ball in your hand will b the 4 kg .
have a nice day.....
6 years ago
shubham   min 2 and max 5 times
5 years ago
rohit   4
5 years ago
kapila   4
4 years ago
mohit   4
4 years ago
vaibhav   c
3 years ago
satish   ans is b....divide the 8 8 8 8 2
then doo
3 years ago

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