Write the contrapositive of " if a number is divisible by 9 then it is divisible by 3".

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Solution

Let p $=$ a number divisible by $9$ .
q $=$ a number divisible by $3$ .
The given statement can be written as $p \Rightarrow q$
Contrapositive is, $7 q \Rightarrow 7 p$
i.e., "If a number is not divisible by $3$ then it is not divisible by $9$ ".

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