Question
Using the given pattern, find the missing numbers:  
$1^2+2^2+2^2=3^2 $
$ 2^2+3^2+6^2=7^2$
$ 3^2+4^2+12^2=13^2 $
$4^2+ 5^2+\_^2= 21^2$
$5^2+\_^2+ 30^2 = 31^2$
$6^2+ 7^2+\_\_\_^2=\_\_\_^2$

Answer

$ 4^2+5^2+20^2=21^2 $
$ 5^2+6^2+30^2=31^2 $
$ 6^2+7^2+42^2=43^2 $

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