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Solution
Expression : $$12x = 19^2 - 11^2$$
=> $$12x = (19-11)(19+11)$$
=> $$12x = (8)(30)$$
=> $$x = \frac{8 \times 30}{12}$$
=> $$x = 2 \times 10 = 20$$
=> Ans - (A)
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