Crack the Code Brain Teaser with Answer

This is a tough crack the code brain teaser to test your IQ. In this brain teaser, you are shown some number equations. These number equations are logical number equations. It means there is a certain hidden code which is used in these number equations. Your challenge in this brain teaser is to crack the code and find the value of the missing number which will replace the question mark. 

Can you crack this brain teaser?

The answer to this "Crack the Code Brain Teaser", can be viewed by clicking on the answer button.

The Answer is 6.
If A=B is the given logical number equation then the hidden logical reasoning for this brain teaser is as below
B=Last Digit of (A*A*A).
It means that multiply A three times with itself and the last digit in this multiplication result is the answer.
eg. 3x3x3 = 27 => 7
2x2x2 = 8 and so on

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