Question

Please see the series: 7, 10, 8, 11, 9, 12, ... What number should come next?

• A. 10
• B. 13
• C. 14
• D. 15

Hint:

"Linked" pairs more naturally with a different preposition here.

Answer 1

The Correct Option is A

The series 7, 10, 8, 11, 9, 12 alternates between adding 3 and subtracting 2: \(7 \xrightarrow{+3} 10 \xrightarrow{-2} 8 \xrightarrow{+3} 11 \xrightarrow{-2} 9 \xrightarrow{+3} 12\).
Since the last operation applied was +3 (getting from 9 to 12), the next operation in the alternating pattern should be -2.
Applying that gives \(12-2=10\), matching option 1.