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5 July, 13:02

Which conditional and its converse form a true biconditional?

A) If x>0, then lxl >0

B) If x=3, then x2^2=9

C) If x^2 = 4, Then x=2

D) If x=19, then 2x-3=35

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Answers (1)
  1. 5 July, 15:25
    0
    The answer is

    D) If x=19, then 2x-3=35

    proof

    If x=19, 2 (19) - 3=38-3=35 so If x=19, then 2x-3=35 is verified

    if 2x-3=35, so 2x=35 + 3, 2x=38 implies x = 19, so x = 19 is verified

    If x=19 if and only if 2x-3=35
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