This is a brain teaser.
If 11 * 11 = 4
22 * 22 = 16
Then
33 * 33 = ?
Answer
No need to take out the calculator !!!
What it seems is not it is.
Now take a look at first one.
11 * 11 = 4
We can also write it as follows
{ 1 + 1 ) * ( 1 + 1 ) = 4
2 * 2 = 4
----------------------------
22 * 22 = 16
=> ( 2 + 2 ) * ( 2 + 2 ) = 16
=> 4 * 4 = 16
----------------------------
33 * 33 = ?
=> ( 3 + 3 ) * ( 3 + 3 )
=> 6 * 6 = 36
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