RBI Assistant Prelims practice question
Simplify: (1.2 × 1.2 × 1.2 + 0.4 × 0.4 × 0.4) ÷ (1.2 × 1.2 − 1.2 × 0.4 + 0.4 × 0.4)
From a RBI Assistant Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 1.6
Use a³ + b³ = (a + b)(a² − ab + b²). The denominator is exactly a² − ab + b², so it cancels and the value is a + b = 1.2 + 0.4 = 1.6.
हिंदी में प्रश्न
सरल कीजिए: (1.2 × 1.2 × 1.2 + 0.4 × 0.4 × 0.4) ÷ (1.2 × 1.2 − 1.2 × 0.4 + 0.4 × 0.4)
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सही उत्तर: (B) 1.6
a³ + b³ = (a + b)(a² − ab + b²) का प्रयोग करें। हर ठीक a² − ab + b² है, अतः वह कट जाता है और मान = a + b = 1.2 + 0.4 = 1.6।
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