Exercise :: Odd Man Out and Series  Missing No.
 Odd Man Out and Series  Odd Man Out
 Odd Man Out and Series  Pick Wrong No.
 Odd Man Out and Series  Missing No.
 Odd Man Out and Series  Find Wrong No.
1.  16, 33, 65, 131, 261, (....) 

Answer: Option A Explanation: Each number is twice the preceding one with 1 added or subtracted alternatively. So, the next number is (2 x 261 + 1) = 523. 
2.  10, 5, 13, 10, 16, 20, 19, (....) 

Answer: Option B Explanation:
There are two series (10, 13, 16, 19) and (5, 10, 20, 40), one increasing by 3 and the other multiplied by 2.

3.  1, 4, 9, 16, 25, 36, 49, (....) 

Answer: Option C Explanation: Numbers are 1^{2}, 2^{2}, 3^{2}, 4^{2}, 5^{2}, 6^{2}, 7^{2}. So, the next number is 8^{2} = 64. 
4.  2, 4, 12, 48, 240, (....) 

Answer: Option B Explanation: Go on multiplying the given numbers by 2, 3, 4, 5, 6. So, the correct next number is 1440. 
5.  8, 7, 11, 12, 14, 17, 17, 22, (....) 

Answer: Option B Explanation: There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22) increasing by 3 and 5 respectively. 