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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 $a \neq b = 1$

The value of $\frac{((1 \neq 1)\neq2)-(-10^{1.3} \neq \log_{10} 0.1)}{2 \Delta 1}$ is

1. $(4–10^{1.3})/2$
2. $1/8$
3. $3/8$
4. $15/8$