16, 32, 64, 128,...... मालिकेतील पहिल्या 10 संख्यांची बेरीज किती आहे?

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RRC Group D Previous Paper 42 (Held On: 16 Oct 2018 Shift 3)
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  1. 16386
  2. 16638
  3. 16368
  4. 13668

Answer (Detailed Solution Below)

Option 3 : 16368
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Detailed Solution

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दिलेले आहे:

भूमितीय श्रेढी असलेले पहिले पद 'a' = 16 आणि समान गुणोत्तर 'r' = 2 

वापरलेली संकल्पना:

या प्रकारच्या प्रश्नामध्ये, जेथे 'r' > 1, नंतर G.P च्या n पदांची बेरीज = Sn 

\( = \frac{{a\left( {{r^n} - 1} \right)}}{{r - 1}}\)

वापरलेले सूत्र:

\({S_n} = \frac{{a\left( {{r^n} - 1} \right)}}{{r - 1}}\)

n = 10

गणना:

दिलेल्या मालिकेचा विचार करून

16, 32, 64, 128, ......

\({S_{10}} = \frac{{16\left( {{2^{10}} - 1} \right)}}{{2 - 1}}\)

⇒ S10 = 16 × 1023 = 16368

∴ दिलेल्या मालिकेतील पहिल्या 10 पदांची बेरीज 16368 आहे

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