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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. 2 , 3 , 6 , 15 , 45 , 156.5 , 630
    1. 3
    2. 45
    3. 15
    4. 6
    5. 156.5
Correct Option: E

As per the details in the question the series is in the form of
First term = 2
Second term = First term × 1.5
Second term = 2 × 1.5 = 3 ;
Third term = Second term × 2
Third term = 3 × 2 = 6 ;
Similarly , we can find all others terms also.
Fourth term = Third term × 2.5 = 6 × 2.5 = 15 ;
Fifth term = Fourth term × 3 = 15 × 3 = 45 ;
Sixth term = Fifth term × 3.5 = 45 × 3.5 =156.5; 156.5 is wrong. It should be 157.5 .
Seventh term = Sixth term × 4 =157.5 × 4 = 630
Hence, 156.5 is wrong. It should be 157.5.


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