Latest CTS Aptitude Question SOLUTION: There are 9 balls of this one is defective. Find the minimum no. of chances of finding the defective one.

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(#M40007371) CTS Numerical Ability question Analytical problem Keep an EYE

There are 9 balls of this one is defective. Find the minimum no. of chances of finding the defective one.

Asked In CTS (12 years ago)

Unsolved Read Solution (11)

Is this Puzzle helpful?   (12)   (8) Submit Your Solution Permutation and Combination

Read Solution (11) :

Avisekh Samanta  (10 years ago)

2 chance
1.9 balls 3 parts 3 in each part
Weight any two part if defective found then well and good else defective in the third part.
2.now divide the defective part(3 balls) in another 3 parts 1 1 1
weight any two if defective ball found ten well and good else 3 ball defective.

Is this solution Helpfull? Yes (19) | No (5)  

Vignesh  (12 years ago)

1 chance minimum for finding defective ball.

If take 1st ball and it is defective.
So, minimum 1 chance.

Is this solution Helpfull? Yes (6) | No (18)  

satyanarayana  (12 years ago)

we will divide into 2 weights 5 and 4
that is one way
5 will become 3 and 2
and we will have to divide


so answer is 3

Is this solution Helpfull? Yes (6) | No (12)  

Gokulnath  (10 years ago)

Minimum Chance is 1..( 9 balls. Juzt weigh 4-4, if it is equal then other one is defective. )
Maximum chances is 3 ( weigh 4-4, if any one is higer, then divde by 2-2, and 1-1 finally u will get the defective one)

Is this solution Helpfull? Yes (3) | No (1)  

Pargat Pal Singh  (12 years ago)

min 2 chances are reqd to find defective ball.

Is this solution Helpfull? Yes (2) | No (12)  

PRADEEPKUMAR N  (10 years ago)

9 balls. 1 is defective
so, 9c1
(i.e) 9/1
answer is 9

Is this solution Helpfull? Yes (2) | No (4)  

Pratik sharma  (9 years ago)

Minimum Chance is when he pick the ball in first chance only thus ..probability of getting a defective ball out of 9 is -> (1/9)

Is this solution Helpfull? Yes (1) | No (1)  

gowtham  (8 years ago)

minimum 3 chances to found the defective ball....
we take 4+4 ball if there is any defective some change in this weight.
we take the defective side and split into 2+2 then we can easily found the defective ball

Is this solution Helpfull? Yes (1) | No   

Madhu  (9 years ago)

Min chance is 1. I faced this question in interview yesterday and i said the sol as follows:
take 4 on each side of balance and if it shoes equal then the remaining one is defective.

Is this solution Helpfull? Yes | No (1)  

nishant raj  (9 years ago)

9=(5,4) again divide 5 in (3,2) ist chance-> we aplly in 2. now we have 4+3 i.e 7 ball, again divide 7=(4,3). now divide 3=(2,1) in 2nd chance we can get again defective one. now we have 4 balls now divide into 4=(3,1) in 3rd chance 3=(2,1) we can get the defective one. IN ALL ABOVE PROCESS WHERE THERE IS 1 BALL NO NEED TO CHECK SO NEGLECTED.

Is this solution Helpfull? Yes | No   

Rishav Kumar  (8 years ago)

min. no. of chances of finding the defective ball out of 9 balls is 1

Is this solution Helpfull? Yes | No   

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