Multiple choice

Find out the wrong number in the series. $27, 81, 1331, 125, 625, 3125$

  1. $125$
  2. $27$
  3. $1331$
  4. $81$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series consists of powers: 27=3³, 81=3⁴, 1331=11³, 125=5³, 625=5⁴, 3125=5⁵. The pattern should be consecutive powers of 3 and 5: 3³, 3⁴, 5³, 5⁴, 5⁵, which gives 27, 81, 125, 625, 3125. The number 1331=11³ breaks this pattern.

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