70 और 100 के मध्य सभी अभाज्य संख्याओं का योग कितना है?

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HTET TGT Mathematics 2017 Official Paper
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  1. 492 
  2. 385 
  3. 421 
  4. 419

Answer (Detailed Solution Below)

Option 1 : 492 
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अवधारणा:

अभाज्य संख्याएँ: 1 से बड़ी कोई भी प्राकृत संख्या, जो केवल स्वंम से तथा 1 से विभाज्य है। 

गणना:

अभाज्य संख्याएँ हैं = 71, 73, 79, 83, 89, 97

⇒ योग = 71 + 73 + 79 + 83 + 89 + 97 = 492

70 और 100 के बीच सभी अभाज्य संख्याओं का योग 492 है।

सही विकल्प 1 अर्थात् 492 है। 
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