Number Series
Direction: In the following number series only one number is wrong. Find out the wrong number.
-  8, 11, 17, 47, 128, 371, 1100
 
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The series is x 3 - 13
Correct Option: C
The series is x 3 - 13
 
-  1, 5, 13, 31, 61, 125, 253
 
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The series is + 22, + 23, + 24, + 25, + 26, + 27
Correct Option: C
The series is + 22, + 23, + 24, + 25, + 26, + 27
 
Direction: What should come in place of the question mark (?) in the following number series?
-  9, 62, ?, 1854, 7415, 22244
 
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The series is x 7 - 1, x 6 -1, x 5 - 1, x 4 - 1, x 3 - 1
Correct Option: D
The series is x 7 - 1, x 6 -1, x 5 - 1, x 4 - 1, x 3 - 1
 
-  4, 8, 24, 60, ?, 224
 
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The series is + 22, + 42, + 62, + 82, + 102
Correct Option: E
The series is + 22, + 42, + 62, + 82, + 102
 
-  8000, 1600, 320, 64, 12.8?
 
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The series is ÷ 5.
Correct Option: A
The series is ÷ 5.