पुढीलपैकी कोणत्या जोडमूळ संख्येच्या जोड्या नाहीत?

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RRC Group D Previous Paper 40 (Held On: 15 Oct 2018 Shift 2)
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  1. 197, 199
  2. 167, 169
  3. 137, 139
  4. 107, 109

Answer (Detailed Solution Below)

Option 2 : 167, 169
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संकल्पना:

जोड मूळसंख्या या अशा संख्या ज्या दोन मूळ संख्येमधील दोनचा (2) फरक असणाऱ्या संख्या आहेत. दुसऱ्या शब्दांत, जोड मूळसंख्या एक मूळसंख्या असते ज्यामध्ये मुख्यत: दोनचे अंतर असते.

पडताळा:

167, 169 याव्यतिरिक्त सर्व जोड मूळसंख्या आहेत,

म्हणून 169 ही 13 ने विभाज्य असल्याने ती मूळ किंवा जोड मूळ संख्या असू शकत नाही.

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