in Mathematical Logic edited by
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Its answer is a) but here more(x,y) is given means it should be like this -- x is more than y then isn't a) is wrong

in Mathematical Logic edited by
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That would depend on How $More(a,b)$ is defined.

If the answer is given $a$ then surely $More(a,b)$ is defined as following :

$More(a,b)$ : $class\,\,a$ has more students than $class \,\,b$.
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ok please clear me one more thing how to know that more(x,y) will come after $\sim$interesting(y) 

bcz we can write it as xy((interesting(x)$\wedge$$\sim$more(x,y) $\implies$interesting(y))

how to read it?

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