How was your answer to this? Had you also to say whether the different one is heavier OR lighter or did they say you that one is heavier/lighter (and not just: one is "different")?

(edited 12 years ago)

Reply 2845

CJ98

Had Barcap phone interview on Monday. Assesment centre on Thursday for Technology division.

Anyone know what to expect except that assesment is 1.5 hours and will include an interview?

I'm thinking Interview -30 min, numerical - 30min, group exercises -30min?

Reply 2846

CJ98

Original post by Michael XYZ

Barclays AC email just came. It's 1 hour "Group Exercise" then "Interviews onwards".

Sorry for the double post, but where did you get this? The standard email didn't detail assesment activities?

Reply 2847

LawQC

1

Original post by natashabedford

Yeah. These things seem to be random :mad:

Good luck in your interview today!

Reply 2848

LawQC

1

Original post by jevira

How was your answer to this? Had you also to say whether the different one is heavier OR lighter or did they say you that one is heavier/lighter (and not just: one is "different")?

split the 8 balls into 3 piles so there are 3 v 3 v 2

If the 3 v 3 weigh the same then measure the balls in the 2 pile.

If one of the 3 v3 is heavier than the other - then weigh 2 balls from a 3 pile - if they weigh the same - the heavier ball is the one left out - or if one is heavier then this is the heavier ball!

Reply 2849

gangst

1

anyone get a DB email this morning saying they are currently processing apps....

Reply 2850

Michael XYZ

2

Original post by CJ98

Sorry for the double post, but where did you get this? The standard email didn't detail assesment activities?

I got sent an email from HR or something stating that.

Reply 2851

laughforever

HSBC randomly just rejected my application. buggers

Reply 2852

jevira

Original post by LawQC

split the 8 balls into 3 piles so there are 3 v 3 v 2

If the 3 v 3 weigh the same then measure the balls in the 2 pile.

If one of the 3 v3 is heavier than the other - then weigh 2 balls from a 3 pile - if they weigh the same - the heavier ball is the one left out - or if one is heavier then this is the heavier ball!

That seems not correct.
All my solutions I would need 3 weighings, crap. After 2 weighings there is a 50/50 chance that you detect the different one.

Reply 2853

Industrious Orca

6

Original post by jevira

That seems not correct.
All my solutions I would need 3 weighings, crap. After 2 weighings there is a 50/50 chance that you detect the different one.

He is correct as long as we know if the different ball is lighter or heavier.

Reply 2854

LawQC

1

Original post by jevira

That seems not correct.
All my solutions I would need 3 weighings, crap. After 2 weighings there is a 50/50 chance that you detect the different one.

no my solution gives 2 weighings - read it properly

Reply 2855

miml

17

Original post by jevira

That seems not correct.
All my solutions I would need 3 weighings, crap. After 2 weighings there is a 50/50 chance that you detect the different one.

Sorry I think the way I wrote the question was ambiguous. We know one ball is heavier (I wrote heavier/lighter as the method is the same either way, but we have to know which one).

From that same solution (and I think it might be the only solution) as LawQC.

Reply 2856

jevira

Original post by LawQC

no my solution gives 2 weighings - read it properly

Yes, I said my solution (if you just know that one is either heavier or lighter) gives 3 weighings.

Your solution is correct as you assume that one is heavier. Would also work if you know that one is lighter. But if you dont know, 2 weighings dont suffice.

Ah, thx miml.

(edited 12 years ago)

Reply 2857

jevira

One more example with 12 balls, you know that one is heavier than the other 11. 3 weighings allowed to find the heavier one.
I always read other solutions, but I think this should also work (please feedback):

First, weigh 6 against 6. (1st use of scale) Then take the heavier group of balls.

Weigh 2 against 2 first, 2 leaving out. (2nd use of scale). If the scale is balanced, weigh the 2 remaining balls, one of them is the heavier. (3rd use of scale).
If our second use of scale isn't balanced, take the heavier group and weigh the 2 balls against each other. One of them is the heavier (3rd).

This is correct too, isn't it?

Reply 2858

miml

17

Original post by jevira

One more example with 12 balls, you know that one is heavier than the other 11. 3 weighings allowed to find the heavier one.
I always read other solutions, but I think this should also work (please feedback):

First, weigh 6 against 6. (1st use of scale) Then take the heavier group of balls.

Weigh 2 against 2 first, 2 leaving out. (2nd use of scale). If the scale is balanced, weigh the 2 remaining balls, one of them is the heavier. (3rd use of scale).
If our second use of scale isn't balanced, take the heavier group and weigh the 2 balls against each other. One of them is the heavier (3rd).

This is correct too, isn't it?