Multiple choice

Directions: In the following number series, one number is wrong. Find out the wrong number. 3, 9, 18, 54, 110, 324, 648

  1. 54

  2. 110

  3. 324

  4. 648
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B Correct answer
Explanation

The pattern is: 3*3=9, 9*2=18, 18*3=54, 54*2=108, 108*3=324, 324*2=648. The number 110 is incorrect; it should be 108.

AI explanation

The series alternates between multiplying by 3 and multiplying by 2. The first term 3 multiplied by 3 gives 9, and 9 multiplied by 2 gives 18. Then 18 multiplied by 3 gives 54, so the next term should be 54 multiplied by 2, which equals 108. The number 110 is incorrect in this position. Continuing the correct pattern, 108 multiplied by 3 gives 324, and 324 multiplied by 2 gives 648, confirming the rule. Therefore, the wrong number is 110.

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