Question

Choose the most appropriate option to replace (?).
34, 18, 10, ?

• A. 8
• B. 5
• C. 7
• D. 6
• E. None of the above

Answer 1

The correct option is D 6

34, 18, 10, ?
$\begin{array}{c}34-18=16\\ 18-10=8\\ 10-?=4\end{array}\}\begin{array}{c}16÷2=8\\ 8÷2=4\end{array}$
Therefore, - ? = 4 - 10
$\Rightarrow$ = ? = -6
$\Rightarrow$ ? = 6