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Instructions: What will come in place of the question mark (?) in the following questions?[(5$$\sqrt{7}$$ + $$\sqrt{7}$$ ) × (4$$\sqrt{7}$$ + 8$$\sqrt{7}$$ )] - (19)2 = ?
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= [6$$sqrt{7}$$ x 12$$sqrt{7}$$] - 192
= [72 x 7] - 192
= 143