ABC26GN1952 · Surds and Indices

Subject: General Aptitude · Chapter: Surds and Indices · Exam: · Marks: · Difficulty:

If 3 – 3 x – 1 = 18, then the value of xx is
(a)3
(b)8
(c)27
(d)216 2n + 4 − 2 × 2n
Answer
Answer (as printed): C
Explanation
3x – 3x – 1 = 18 ⇔ 3x – 1 (3 – 1) = 18 ⇔ 3x – 1 = 9 = 32 ⇔ x – 1 = 2 ⇔ x = 3. ∴ xx = 33 = 27. 2n + 4 − 2 × 2n 2n + 4 − 2n + 1 1

Explanation as extracted from the printed page; notation may be imperfect.

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