{(0.98)3 + (0.02)3 + 3 × 0.98 × 0.02 – 1} এর মান নির্ণয় করুন। 

This question was previously asked in
RRC Group D Previous Paper 2 (Held On: 18 Sep 2018 Shift 1)
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  1. 1.98
  2. 1.09
  3. 1.562
  4. 0

Answer (Detailed Solution Below)

Option 4 : 0
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Detailed Solution

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প্রদত্ত:

{(.98)3 + (0.02)3 + 3 × 0.98 × 0.02 – 1}

অনুসৃত ধারণা:

⇒ (a + b)3 = a3 + b3 + 3ab(a + b)

গণনা:

{(.98)3 + (0.02)3 + 3 × 0.98 × 0.02 – 1

⇒ [(.98)3 + (0.02)3 + 3 × 0.98 × 0.02(0.98 + 0.02)} – 1]

এখন, প্রথম পদটি  (a + b)আকারে রয়েছে যেখানে a = .98 এবং b = 0.02

⇒ (0.98 + 0.02)3 – 1 = 1 – 1 = 0

∴ নির্ণেয় মান হল 0

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