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Question
What number should come next?
3 9 23 99 479 2881 20159
Options:
A .  9
B .  23
C .  99
D .  479
E .  2881
Answer: Option E


3 9 23 99 479 2881 20159 
 Here 3x2+3 =9
 9x3-4 =23 
23x4+5 =97
97x5-6 =479 
479x6+7=2881
2881x7-8 =20159


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