Question

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

• A. $4$
• B. $6$
• C. $5$
• D. $3$

Answer 1

The correct option is D $3$

$x+(x+2)<16$
$\Rightarrow 2x+2<16$
$\Rightarrow x<7$
$\therefore x=2,4,6$
$\Rightarrow$ Pairs will be $(2,4),(4,6),(6,8)$