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Q. The negation of the statement 7 is greater than 4 or 6 is less than 7 .

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Solution:

Let $p: 7$ is greater than 4 and $q: 6$ is less than 7 .
Then, the given statement is disjunction $p \vee q$.
Here, $\sim p: 7$ is not greater than 4 .
and $\sim q: 6$ is not less than 7 .
$\therefore \sim(p \vee q): 7$ is not greater than 4 and 6 is not less than 7.