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Draw 4 straight lines and try and cover all 9 the dots.

+3 votes
744 views

.Draw 9 dots on a page, in the shape of three rows of three dots to form a square. Now place your pen on the page, draw 4 straight lines and try and cover all the dots.

posted Nov 10, 2013 by Mona Sharma

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Generalized Solution

No. of Dots    Required Straight Lines
3 x 3               (3 + 1) = 4
4 x 4               (4 + 2) = 6
5 x 5               (5 + 3) = 8
6 x 6               (6 + 4) = 10
n x n               (n+ (n - 2)) = 2n - 2

2 Answers

+2 votes
answer Nov 10, 2013 by Vikas Upadhyay
–1 vote

start from the last member of first row one horizontal line and first member of first and second row with vertical line and last member of second row and third row add with the other vertical line ,and start from the last member from last row ,one horizontal line till the first member of last row.

in below fig let " A "is the blank space and

0---------0------0
|
|
0---------0------0
                 |
                 |
0---------0------0
answer Dec 31, 2013 by Sandeep
But these are five lines
So you started counting from 0.
0 1 2 3 4 :) :P



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