What should come in place of ‘?’ in the following number series?
12, 24, 144, ?, 1728, 3456
⇒ 12 × 2 = 24
⇒ 24 × 6 = 144
⇒ 144 × 2 = 288 = ?
⇒ 288 × 6 = 1728
⇒ 1728 × 2 = 3456
3. What should come in place of question mark ‘?’ in the following number series? 6, 6, 9, 18, 45, ?
6. What will come in place of question mark ‘?’ in the following question? 622 – 322 + ?2 = 3144
7. What will come in place of the question mark (?) in the following number series? 5, 6, 14, 23, 87, ?