188, 154, 140, 132, 128, 126, 125

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Step-by-step reasoning:

1. Write the sequence: 188, 154, 140, 132, 128, 126, 125.
2. Work from the end and compute successive increments:
   - $125	o126$ is $+1$,
   - $126	o128$ is $+2$,
   - $128	o132$ is $+4$,
   - $132	o140$ is $+8$.
3. The increments follow powers of two: $+1,+2,+4,+8,\dots$; continuing backward gives the next increment $+16$ and then $+32$.
4. Applying those: $140+16=156$ and $156+32=188$. So the correct second term should be $156$, not $154$.

Therefore the wrong number in the given series is 154.
FINAL_ANSWER: a

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