Comprehension

निर्देश : निम्नलिखित प्रश्नों के लिए निम्नलिखित पर विचार करें :  

एक समान्तर श्रेणी के 5 क्रमागत पदों का गुणनफल 229635 है। पहला, दूसरा और पाँचवाँ पद गुणोत्तर श्रेणी में हैं। 

सभी पाँच पदों का योग क्या है?

This question was previously asked in
NDA-II 2024 (Maths) Official Paper (Held On: 01 Sept, 2024)
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  1. 60
  2. 65
  3. 75
  4. 80

Answer (Detailed Solution Below)

Option 3 : 75
Free
NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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व्याख्या:

समीकरण (ii) में d का मान रखने पर, हमें प्राप्त होता है

⇒ 5 x 6 = 2a

⇒ a = 15

इस प्रकार, पद हैं 3, 9, 15, 21 और 27

इसलिए आवश्यक योग = 3 + 9 + 15 + 21 + 27 = 75

∴ विकल्प (c) सही है

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