Question
Download Solution PDFखालील मालिकेतील पहिल्या 25 पदांची बेरीज असेल.
7, 11, 15, 19, 23, …
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFदिलेले आहे:
मालिका = 7, 11, 15, 19, 23, …
वापरलेले सूत्र:
Sn = n / 2 × {2a + (n - 1) × d}; जिथे n= पदांची संख्या, d = सामाईक फरक, a = प्रथम पद, Sn = n पदांची बेरीज; d = (a2 - a1); a2 = गणितीय श्रेढीचे दुसरे पद, a1 = गणितीय श्रेढीचे पहिले पद
गणना:
वरील सूत्र वापरून, आपल्याला d = 4 मिळेल
⇒ S25 = 25 / 2 × {2 × 7 + (25 - 1) × 4}
⇒ S25 = 55 × 25
⇒ S25 = 1375
25 पदांची आवश्यक बेरीज = 1375
त्यामुळे बरोबर उत्तर 1375 आहे.
Last updated on Jun 11, 2025
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