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4 3 7=42, 6 3 8=91 5 3 9=?

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 Solution: It is clear that

\ Rightarrow 7^2-4^2-3^2=49-16-9=24

Now , change the place of digits .\42

Similarly ,\Rightarrow 8^2-6^2-3^2=64-36-9=19

Change the place digit \91

Now, \ 9^2-5^2-3^2=81-25-9=47 

change the place digit 74

 

Posted by

Deependra Verma

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