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If 19 (36) 13 and 37 (81) 28, then what is the value of 'A' in 43 (A) 38?

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CCommunity
option 2 : - 25
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CCommunity
$19-13=6 : 6^2=36$
$37-28=9 : 9^2=81$
$43-38=5 : 5^2=25$
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