(3.8 × 3.8 - 1.2 × 1.2) ÷ (3.8 - 1.2) = ?

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NPCIL Assistant Grade-1 (Advance) Official Paper-II (Held On: 08 Sept, 2018)
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  1. 3.8
  2. 1.2
  3. 2.6
  4. 5.0

Answer (Detailed Solution Below)

Option 4 : 5.0
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NPCIL Assistant Grade 1 Computer Knowledge Subject Test - 01
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Detailed Solution

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Formula used:

a2 - b2 = (a + b)(a - b)

Calculation:

(3.8 × 3.8 - 1.2 × 1.2) ÷ (3.8 - 1.2) 

⇒ (3.82 - 1.22) ÷ 2.6

⇒ (3.8 + 1.2)(3.8 - 1.2) ÷ 2.6

⇒ 5 × 2.6 ÷ 2.6

⇒ 5 × 2.6 × 1/2.6

⇒ 5

∴ The correct answer is option (4).

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