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

Question

.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.

Comments

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

Answer 1

Answer 2

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

Comments

But these are five lines

---

So you started counting from 0.
0 1 2 3 4 :) :P