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Probability Level 1

How many line segments are there in the given figure?

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The answer is 11.

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Sandeep Bhardwaj by Sandeep Bhardwaj , 28, India

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8 solutions

Count number of endpoints. Divide by two.

21 Helpful 0 Interesting 1 Brilliant 0 Confused
Frank Rodriguez
Mar 26, 2015

Aren't these all line segments, not lines? I said 0 at first.

5 Helpful 0 Interesting 0 Brilliant 0 Confused

I too thought that these are line segments and typed zero at first.

Swapnil Das - 6 years, 2 months ago

Thanks. I've edited the problem accordingly. Those who answered 0 have been marked correct.

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Calvin Lin Staff - 6 years, 2 months ago

I also thought the same

Abdur Rehman Zahid - 6 years, 2 months ago

Pull up image in paint. Erase one line with the eraser, that is one line. Erase line 2......ect. total is 11 lines.

4 Helpful 0 Interesting 0 Brilliant 0 Confused
Varun M
Apr 19, 2016

You are right Raghav that's the easiest way to do it.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Count d i a g o n a l U P \boxed {diagonal UP} lines and then d i a g o n a l D O W N \boxed {diagonalDOWN} lines. Add them to get the result.

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Marina Caballero
Aug 4, 2015

I just counted the lines

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Anton Shkrunin
Aug 24, 2015

Counted intersections and added 1 to each to get the number of line segments... After i got it wrong, i thought the question may be just about the number of line segments, not segments on each of them.

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Romil Jangalwa
May 3, 2015

Count the number of ends and divide by 2. Its the easiest way.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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