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Collection missing number#puzzle 116

Practical exercise for all competitive exams

Find the missing number

puzzle 116

with answer.


 How are the numbers in the shape related?
What number will replace the question mark
 
Below you can see the correct answer and detail explanation.



5^2-3^2=25-9=16
4^2-2^2=16-4=12

4^2-3^2=16-9=7
5^2-2^2=25-4=21


Correct answer is 21


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