उन सभी अभाज्य संख्याओं का योग जो 31 से कम हैं, है

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Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)
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  1. 129
  2. 139
  3. 132
  4. 137

Answer (Detailed Solution Below)

Option 1 : 129
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Bihar STET Paper 1 Mathematics Full Test 1
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व्याख्या

31 से छोटी अभाज्य संख्याएँ नीचे दी गई हैं:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29

d = a1 – a2 ≠ a2 – a3

चूँकि उपरोक्त श्रृंखला समांतर श्रेणी या गुणोत्तर श्रेणी जैसे किसी भी मानक का अनुसरण नहीं करती है। इसलिए योगफल ज्ञात करने के लिए हम श्रृंखला को सामान्य रूप से जोड़ेंगे। 

S = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 = 129

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