| Which number will replace the question mark (?) in the following series? |
| निम्नलिखित श्रृंखला में कौन-सी संख्या प्रश्न चिह्न (?) के स्थान पर आएगी? |
| 20, 10, 10, 15, 30, ? |
A) 45
B) 90
C) 60
D) 75
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