{(0.98)3 + (0.02)3 + 3 × 0.98 × 0.02 – 1} का मान ज्ञात कीजिये।

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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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RRB Group D Full Test 1
100 Qs. 100 Marks 90 Mins

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दिया गया है:

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

प्रयुक्त अवधारणा:

(a + b)3 = a3 + b3 + 3ab(a + b)

गणना:

{(.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]

अब, पहला पद (a + b)3 रूप का है जहाँ a = .98 और b = 0.02

⇒ (0.98 + 0.02)3 – 1 = 1 – 1 = 0

∴ मान 0 है

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