যদি a, b, c সমান্তর প্রগতিতে থাকে তবে নীচের কোনটি সঠিক? 

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ALP CBT 2 Physics and Maths Previous Paper 2 (Held On: 21 Jan 2019 Shift 2)
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  1. 2a = b + c
  2. 2c = a + b
  3. 3b = 2a + 3c
  4. 2b = a + c

Answer (Detailed Solution Below)

Option 4 : 2b = a + c
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অনুসৃত ধারণা:

ধরি a, b, c… হলো আমাদের প্রগতি

যেহেতু আমরা জানি, সাধারণ অন্তর = b – a, c – b.

সমান্তর প্রগতিতে সাধারণ অন্তর সমান হয়

b – a = c – b

গণনা:

b - a = c - b

⇒ b + b = c + a

⇒ 2b = c + a

⇒ 2b = a + c

∴ a, b, c সমান্তর প্রগতিতে থাকলে 2b = a + c.

ধরি 1, 2, 3 সংখ্যাগুলি সমান্তর প্রগতিতে রয়েছে

কেবল একটি বিকল্পই সমীকরণের শর্ত পূরণ করবে। 

2(2) = 1 + 3 সুতরাং 2b = a + c সঠিক বিকল্প

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