In the following number series a wrong number is given. Find out the wrong number.
4. 150 290 560 1120 2140 4260 8400
(1) 2140
(2) 560
(3) 1120
(4) 4230
(5) 290

• Answer : 1120
  
  150 x2 - 10 = 290
  
  290 x 2 - 20 = 560
  
  560 x 2 - 30 = 1090
  
  1090 x2 - 40 = 2140
  
  So wrong number in the series is 1120.
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