# Interview Experience - Logical Test

posted 8 years ago

Dear All,

Recently, I had undergone the recruitment process of a services company [hints removed]. I completed telephonic interview and code assignment. They invited me for other rounds of recruitment process.

The first thing I faced at their office was the analytical test, where I couldn't succeed and they suggested me to apply after six months.

I am very keen on joining that company. The kind of puzzles they gave me are very challenging to solve. A typical puzzle will have many boxes and each box contains a number. Box in number indicates the number inside the box and box number indicates the number of the box. I had to follow various steps to arrive at an answer. The typical step like...

1. (Number in box 1) + (Number in box 7). Put result in box 10.

2. (Number in box 10) - (Number in box 8). Put result in box 1.

3. ...

4. ...

Finally, I will have to find out the value of a particular box. Like, "what will be value of box 10?".

If you guys knows any information on where can I get this kind of puzzles to practice, please do share with me. Ofcourse, I am also searching at various sources for these.

Thanks in advance,

[ August 02, 2007: Message edited by: David O'Meara ]

Recently, I had undergone the recruitment process of a services company [hints removed]. I completed telephonic interview and code assignment. They invited me for other rounds of recruitment process.

The first thing I faced at their office was the analytical test, where I couldn't succeed and they suggested me to apply after six months.

I am very keen on joining that company. The kind of puzzles they gave me are very challenging to solve. A typical puzzle will have many boxes and each box contains a number. Box in number indicates the number inside the box and box number indicates the number of the box. I had to follow various steps to arrive at an answer. The typical step like...

1. (Number in box 1) + (Number in box 7). Put result in box 10.

2. (Number in box 10) - (Number in box 8). Put result in box 1.

3. ...

4. ...

Finally, I will have to find out the value of a particular box. Like, "what will be value of box 10?".

If you guys knows any information on where can I get this kind of puzzles to practice, please do share with me. Ofcourse, I am also searching at various sources for these.

Thanks in advance,

[ August 02, 2007: Message edited by: David O'Meara ]

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Jay Dilla

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Rahul Bhattacharjee

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posted 8 years ago

One similar sounding problem is the one labeled "Einsteins's Problem". I found one example of that here

Regards, Andrew

[ August 02, 2007: Message edited by: Andrew Monkhouse ]

Regards, Andrew

[ August 02, 2007: Message edited by: Andrew Monkhouse ]

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Mark Herschberg

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Posts: 6037

posted 8 years ago

There are lots of puzzle and game books out there; you might want to TAKE A LOOK AT "How Would You Move Mount Fuji?: Microsoft's Cult of the Puzzle -- How the World's Smartest Companies Select the Most Creative Thinkers" specifically.

This puzzle by the way, seems to simply be linear algebra. You can put it into a matrix and apply row reduction (assuming the system of equations isn't over or under specified). I would argue that this is not a good interview question because either you know/remember linear algebra (and recognize when to apply it) or you don't. You can brute force it by hand, but it will take time.

--Mark

This puzzle by the way, seems to simply be linear algebra. You can put it into a matrix and apply row reduction (assuming the system of equations isn't over or under specified). I would argue that this is not a good interview question because either you know/remember linear algebra (and recognize when to apply it) or you don't. You can brute force it by hand, but it will take time.

--Mark

Mark Herschberg

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Posts: 6037

Max Habibi

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posted 8 years ago

I'd say that's overkill: you don't need matrix algebra for a problem like that, unless they're moving

Yucko.

they probably just wanted to see if the guy could create an algebraic expression with multiple variables.

It's a tricky question, to be honest. I don't really like these sorts of hazing questions, and think you're probably better off not working for a company like that.General logic questions are fine: but not this, out of the blue. How could you possibly know what arcane area of knowledge that particular interview in the mood to show-off with today?

Originally posted by Mark Herschberg:

There are lots of puzzle and game books out there; you might want to TAKE A LOOK AT "How Would You Move Mount Fuji?: Microsoft's Cult of the Puzzle -- How the World's Smartest Companies Select the Most Creative Thinkers" specifically.

This puzzle by the way, seems to simply be linear algebra.

--Mark

I'd say that's overkill: you don't need matrix algebra for a problem like that, unless they're moving

*systems*of boxes, and mapping them to another plane: besides, you don't want to get into mapping their boxes to matrix o-ordinates, then translating back.

Yucko.

they probably just wanted to see if the guy could create an algebraic expression with multiple variables.

It's a tricky question, to be honest. I don't really like these sorts of hazing questions, and think you're probably better off not working for a company like that.General logic questions are fine: but not this, out of the blue. How could you possibly know what arcane area of knowledge that particular interview in the mood to show-off with today?

Mark Herschberg

Sheriff

Posts: 6037

posted 8 years ago

It's actually the same thing. You don't need advanced matrix techniques but rather the stuff covered in the first 2 weeks. Basically each equation becomes a row in the matrix; row reduction is the equivalent of adding two equations together. (Maybe I'm misunderstanding the problem.)

--Mark

Originally posted by Max Habibi:

I'd say that's overkill: you don't need matrix algebra for a problem like that, unless they're movingsystemsof boxes, and mapping them to another plane: besides, you don't want to get into mapping their boxes to matrix o-ordinates, then translating back.

It's actually the same thing. You don't need advanced matrix techniques but rather the stuff covered in the first 2 weeks. Basically each equation becomes a row in the matrix; row reduction is the equivalent of adding two equations together. (Maybe I'm misunderstanding the problem.)

--Mark