Multiple choice

Find the wrong number in the given series : 2, 5, 10, 3, 6, 18, 4, 7, 30

  1. 7

  2. 10

  3. 30

  4. 6
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C Correct answer
Explanation

The series consists of triplets (2,5,10), (3,6,18), (4,7,30). In each triplet, the first number × second number = third number: 2×5=10, 3×6=18. For the third triplet, 4×7 should be 28, not 30. Therefore 30 is the wrong number.

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