Multiple choice

Find the wrong number in the following number series? 27 189 201 1372 1379 9653

  1. 189

  2. 201

  3. 1372

  4. 1379

  5. 9653
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern alternates between multiplication and addition operations. Starting with 27: 27 × 7 = 189 ✓; 189 + 12 = 201 ✓; 201 × 7 = 1407 (not 1372). The number 201 breaks the pattern because 201 × 7 = 1407, but we have 1372. If we had 201 × 7 = 1407, then 1407 + 12 = 1419 (not 1379), 1419 × 7 = 9933 (not 9653). Actually checking: 27 × 7 = 189, 189 + 12 = 201, 201 × 7 = 1407, 1407 + 12 = 1419, 1419 × 7 = 9933. The given number 1372 = 196 × 7, so 196 should have been there instead of 201. Thus 201 is the wrong number.

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