Let 2nd number be 'x' Therefore, 1st number = 2x And, 3rd number = 2 X 2x = 4x Therefore, x + 2x + 4x = (21 X 3) = 63 ATQ; 7x = 63 Or, x = 9 Required sum = 2x + 4x = 6x = 6 X 9 = 54 Hence, option a.
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