Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?
A
7
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B
10
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C
14
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D
15
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Solution
The correct option is A 15 This alternating addition series begins with 3; then 1 is added to give 4; then 3 is added to give 7; then 1 is added, and so on.