Question
Download Solution PDFకింది వరుసలోని మొదటి 25పదాల మొత్తం
7, 11, 15, 19, 23, …
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFఇచ్చిన దత్తాంశం:
వరుస = 7, 11, 15, 19, 23, …
ఉపయోగించిన సూత్రం:
Sn = n / 2 × {2a + (n - 1) × d}; ఇక్కడ n= పదాల సంఖ్య, d =బేధం, a = మొదటి పదం, Sn = n పదాల మొత్తం; d = (a2 - a1); a2 = అంకశ్రేడిలో రెండవ పదముA.P., a1 = అంక శ్రేడిలో మొదటి పదం
లెక్కింపు:
పై సూత్రాన్ని ఉపయోగించడం వల్ల మనకు d = 4 వస్తుంది
⇒ S25 = 25 / 2 × {2 × 7 + (25 - 1) × 4}
⇒ S25 = 55 × 25
⇒ S25 = 1375
కావాల్సిన 25 పదాల మొత్తం= 1375
కాబట్టి సరియైన సమాధానం1375.
Last updated on Jun 11, 2025
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