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Spot the incorrect term in the series: 3, 4, 10, 33, 138, 685

Competition practiceNumber Series

A138
B33
C10
D685

Step-by-Step Solution

Rule:

\times 1 + 1, \times 2 + 2, \times 3 + 3, \times 4 + 4, \times 5 + 5

. 3→4→10→33→136→685. The fifth term should be 136, not 138 (and

136 \times 5 + 5 = 685

confirms it).

Answer: A) 138

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