Let c who can crack dis 5-4=23 - Whatsapp Puzzles World, Quiz, Games, Riddles And Messages

Let c who can crack dis 5-4=23

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Lets see who can crack this
5 - 4 = 23
8 - 1 = 63
6 -16 = 32
9 - 9 = 78
3 - 9 = 6
3 - 81 = ?
Genius heads try this 
Explain the Logic

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Answer is 0
The logic is
(Square of 5) - (Square root of 4) = 25 - 2 = 23
hence,
(3*3) - (Square roo of 81) = 9 - 9 = 0
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