Look at this series: 7, 10, 8, 11, 9, 12, … What number should come next?

MCQs Preparation, Maths MCQs, Mocks, Selected MCQs /

A. 7
B. 10
C. 12
D. 13

B. 10

7+3=10

10-2=8

8+3=11

11-2=9

9+3=12

The series is following alternating number addition and subtraction. First, 3 is added, then, 2 is subtracted, then 3 is added, and so on.

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