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  9. Q67

UKPSC PCS 2012 · Question 67 of 78

Find the value of 42 + 42 + 42 + …. upto ∞

Quant

  1. A7Correct
  2. B–7
  3. C–6
  4. DNone of these

Answer: A. 7

Explanation

Let x = sqrt(42+sqrt(42+...)); x^2 = 42+x gives x = 7 (positive root).

Source: UKPSC 2012 Prelims CSAT Paper-II (adda247/studyfry PDF), exam held 30 Nov 2014

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