1 మరియు 37 మధ్య సరి సంఖ్యల మొత్తం ఎంత?

  1. 171
  2. 342
  3. 129
  4. 428

Answer (Detailed Solution Below)

Option 2 : 342
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Detailed Solution

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⇒ అవసరమైన మొత్తం = 2 + 4 + 6 + 8 + ……. + 36

⇒ అవసరమైన మొత్తం = 2 (1 + 2 + 3 + …… + 18)

మనకు తెలిసింది,

మొదటి n సహజ సంఖ్యల మొత్తం = n (n + 1) / 2

⇒ అవసరమైన మొత్తం = 2 × n × (n + 1) / 2 (ఇక్కడ n = 18)

⇒ అవసరమైన మొత్తం = 18 × 19 = 342
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