Select the number that can replace the question mark (?) in the following series. |
निम्नलिखित श्रृंखला में प्रश्न-चिन्ह (?) की जगह आने वाली संख्या का चयन करें |
1, 5, 9, ?, 21 |
A) 11
B) 15
C) 20
D) 19
Correct Answer: B
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