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The following operations are defined for real numbers:

$a \neq  b = a + b$ if $a$ and $b$ both are positive

else $a \neq b = 1$.

$a \bigtriangledown b = (ab)^{a+b}$ if $ab$ is positive

else $a \bigtriangledown b = 1$.

The value of $\frac{(2\neq3)\neq ((-1)\Delta 5)}{(1\Delta 2) \neq((-1)\neq5)}$ is

  1. $2/3$ 
  2. $1/2$ 
  3. $1/3$ 
  4. None of these
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