Question:
Find the missing number in the series:
3, 15, 39, ?, 123
श्रृंखला में लुप्त संख्या ज्ञात कीजिए:
3, 15, 39, ?, 123
Options:
- 105
- 90
- 75
- 120
- 105
- 90
- 75
- 120
Correct Answer: c)
Explanation:
Differences:
\(15 – 3 = 12\)
\(39 – 15 = 24\) (+12)
Next difference = \(24 + 12 = 36\).
Missing term = \(39 + 36 = 75\).
Verification: \(75 + 48 = 123\).
अंतर:
\(15 – 3 = 12\)
\(39 – 15 = 24\)
अगला अंतर = \(24 + 12 = 36\)।
लुप्त पद = \(39 + 36 = 75\)। (जांच: \(75 + 48 = 123\))।