যদি a, b, c থাকে AP তে, তাহলে 3a , 3b , 3c কোথায় থাকে ?

  1. A.P
  2. G.P
  3. H.P
  4. কোনটিই না 

Answer (Detailed Solution Below)

Option 2 : G.P
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a, b, c আছে AP তে

⇒ b - a = c - b ⇒ 2b = a + c---(1)

যদি a, b, c থাকে GP তে তাহলে 

⇒ 

উভয় পক্ষকে বর্গ করে আমরা পাই

 ⇒ 2b = a + c -----(2)

(1) এবং (2) থেকে আমরা পাই

ক্রমটি হল   আছে GP তে

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