The number of pairs of consecutive even natural numbers whose sum is less than $16$ is

4

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6

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5

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3

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Solution

The correct option is D $3$
$x + (x + 2) < 16$
$\Rightarrow 2 x + 2 < 16$
$\Rightarrow x < 7$
$∴ x = 2, 4, 6$
$\Rightarrow$ Pairs will be $(2, 4), (4, 6), (6, 8)$

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