{(0.98)3 + (0.02)3 + 3 × 0.98 × 0.02 – 1}இன் மதிப்பைக் கண்டறியவும்

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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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கொடுக்கப்பட்டது:

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

பயன்படுத்தப்பட்ட கருத்து:

(a + b)3 = a3 + b3 + 3ab(a + b)

கணக்கீடு:

{(.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]

இப்போது, முதல் எண் வடிவம் (a + b)வடிவத்தில் உள்ளது, இதில் a = .98 மற்றும் b = 0.02

⇒ (0.98 + 0.02)3 – 1 = 1 – 1 = 0

∴ மதிப்பானது 0.

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