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Spot the term that does not fit: 3, 4, 10, 34, 136, 685

Competition practiceNumber Series

A34
B10
C136
D685

Step-by-Step Solution

Rule: multiply by

n

and add

n

for

n = 1

, 2, 3, …:

3 \times 1 + 1 = 4, 4 \times 2 + 2 = 10, 10 \times 3 + 3 = 33, 33 \times 4 + 4 = 136, 136 \times 5 + 5 = 685

. So 34 should be 33.

Answer: A) 34

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