| Which number will replace the question mark (?) in the following series? |
| निम्नलिखित श्रृंखला में प्रश्न चिन्ह (?) के स्थान पर कौन सी संख्या आएगी? |
| 6, 12, 36, 144, ? |
A) 720
B) 520
C) 620
D) 420
Correct Answer: A
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