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Direction: In each of these questions a number series is given. Only one number is wrong in each series. You have to find out the wrong number.

  1. 10 ,15 , 24 , 35 , 54 ,75 ,100
    1. 35
    2. 75
    3. 24
    4. 15
    5. 54
Correct Option: A

The given series is in the below pattern,
First term = 10
Second term = First term + 5 = 15
Second term = 10 + 5 =15 ,
Third term = Second term + 9 = 24
Third term = 15 + 9 = 24 ,
Similarly , we can find the all others terms also.
24 + 13 = 35, is wrong. It should be 37.
Fourth term = Third term + 13 = 37 + 17 = 54 ,
Fifth term = Fourth term + 17 = 54 + 21 = 75 ,
Sixth term = Fifth term + 21 = 75 + 25 = 100
The difference in successive nos. 9 – 5 = 13 – 9 = 17 – 13 = 21 - 17 = 4.
Hence, 35 is wrong. It should be 37.


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