If n is a positive integer, which of the following is always odd?

19 n + 6

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19 n + 5

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19 n^{2} + 5

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18 n + 4

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18 n + 5

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Solution

The correct option is E $18 n + 5$
given $n$ is positive integer
$\Rightarrow 18 n$ is always even
$∴ 18 n + 5$ is always odd
So the correct answer is $E$ .

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