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Question
7   13   25   49   97   194   385  Find out the wrong number?
Options:
A .  13
B .  49
C .  97
D .  194
E .  25
Answer: Option D


7x2 -1 =13 
13x2- 1 = 25 
25x2 -1 =49 
49x2-1 =49 
97x2 -1 = 193 ≠ 194 
193x2 -1 = 385



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