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Question

In the following number series, a wrong number is given. Find the wrong number.
21, 455, 445, 465, 435, 485, 415, 475


  1. 465
  2. 475
  3. 435
  4. 455
  5. 445


Solution

The correct option is B 475
Series formed by numbers at odd and even places respectively are:
455, 465, 485, 475             ...(1)
and,
445, 435, 415                      ...(2)
The difference between successive terms of I are:
10, 20, - 10

and of 2 are
- 10,-20
- 10 in (1) is abnormal. It should be 30.
475 is wrong and should be replaced by 485 + 30 = 515.
 

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