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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. 5 , 8 ,16 , 26 , 50 , 98 ,194
    1. 8
    2. 26
    3. 50
    4. 16
    5. 98
Correct Option: D

The given series is in the below pattern,
Next term = ( Previous term × 2 ) - 2
First term = 5
Second term = ( First term × 2 ) - 2
Second term = ( 5 × 2 ) - 2 = 8 ;
Third term = ( Second term × 2 ) - 2
Third term = ( 8 × 2 ) - 2 = 16; 16 is wrong. It should be 14.
Similarly , we can calculate all others terms also.
Fourth term = ( Third term × 2 ) - 2
Fourth term = ( 14 × 2 ) - 2 = 26 ;
Fifth term = ( Fourth term × 2 ) - 2
Fifth term = ( 26 × 2 ) - 2 = 50 ;
Sixth term = ( Third term × 2 ) - 2
Sixth term = ( 50 × 2 ) - 2 = 98 ;
Seventh term = ( Sixth term × 2 ) - 2
Seventh term = ( 98 × 2 ) - 2 = 194
Hence, 16 is wrong. It should be 14.


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