एक गुणोत्तर श्रेणी (GP) में 200 पद हैं। यदि इस GP के विषम पदों का योगफल m है, और सम पदों का योगफल n है, तो इसका सार्व अनुपात क्या है?

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NDA (Held On: 17 Nov 2019) Maths Previous Year paper
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  1. m/n
  2. n/m
  3. m + (n/m) 
  4. n + (m/n) 

Answer (Detailed Solution Below)

Option 2 : n/m
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अवधारणा:

यदि a1, a2, ….., an , GP  में है तो सार्वअनुपात इस प्रकार होगा: r = ai + 1 / ai ∀ i =1, 2, …., n - 1.

एक GP का  nth पद होगा :  an = arn - 1, जहाँ a प्रथम पद है और r सार्वअनुपात है। 

गणना​:

दिया है: यदि GP के विषम पदों का योग m है, और GP के सम पदों का योग n है

⇒ r = n / m.

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