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Direction: In each of the following questions, a number series is given in which one number is wrong. You have to find out that number and have to follow the new series which will be started by that number. By following this, which will be the second number of the new series?

  1. 7, 23, 58, 127, 269, 555
    1. 263
    2. 261
    3. 299
    4. 286
    5. None of these
Correct Option: B

The order of above series is given as
First term = 7
Second term = ( First term x 2 ) +9
Second term = ( 7 x 2 ) + 9 = 14 + 9 = 23
Third term = ( Second term x 2 ) +11
Third term = ( 23 x 2 ) + 11 = 46 + 11 = 58 is wrong , 57 should be Third term because ( 23 × 2 ) + 11 = 57 .
Similarly we can find all others terms also.
Fourth term = ( Third term x 2 ) +13
Fourth term = ( 57 x 2 ) +13
Fifth term = ( Fourth term x 2 ) +15
Fifth term = ( 127 × 2 ) + 15 = 269
Sixth term = ( Fifth term x 2 ) +17
Sixth term = ( 269 × 2 ) + 17 = 555



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