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Question
What number should come next?
10 20 25 35 40 50 55
Options:
A .  70 65
B .  60 70
C .  60 75
D .  60 65
E .  65 70
Answer: Option E


This is an alternating addition series, in
which 10 is added, then 5, then 10, and
so on.



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