Find the missing term in the following number series :
2, 9, 28, ?, 126, 217, 344निम्न संख्या श्रेणी में लुप्त पद ज्ञात कीजिए :
2, 9, 28, ?, 126, 217, 344

1. A37
2. B65
3. C91
4. D115

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Correct answer: B. 65

Explanation

Each term is one more than a perfect cube: 1³+1 = 2, 2³+1 = 9, 3³+1 = 28, 4³+1 = 65, 5³+1 = 126, 6³+1 = 217, 7³+1 = 344. The missing term is therefore 65.प्रत्येक पद एक पूर्ण घन से एक अधिक है : 1³+1 = 2, 2³+1 = 9, 3³+1 = 28, 4³+1 = 65, 5³+1 = 126, 6³+1 = 217, 7³+1 = 344। अतः लुप्त पद 65 है।