Question

3, 1.5, 6, 3, 9, ?

• A. $12$
• B. $12.5$
• C. $4.5$
• D. $6$

Answer 1

The correct option is C $4.5$

This series the combination of two series in alternate terms (i) 3, 6, 9, 12 and
(ii) 1.5, 3, 4.5
The term in place of ? is 3 $\times$ 1.5 = 4.5 OR
Divide the first , 3rd, 5th terms by 2 to get the second, fourth, sixth terms.
$\therefore$ ? = 9 $÷$ 2 = 4.5