The pronunciation of "plus" in de plus en plus in the last example (J'ai de plus en plus de mal à me concentrer.) has 's' in both the plus

Question

Is this correct? Because in all other examples only the plus has 's' prononuced as it is followed by vowel 'e'.

Accepted Answer

Hi Mohit, 
Not always but in the expression 'de plus en plus' you can say:
De pluz en plu or de pluz en plusse...
The first 's'  is pronounced as a 'z' because of the compulsory liaison and the second 's' can be pronounced or not.
Hope this helps!

Answer

correction -  Because in all other examples only the FIRST plus has 's' prononuced as it is followed by vowel 'e'.

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Hi Mohit,
Thanks for pointing this out, you can actually say both ...

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Thanks Cecile. Just to confirm - this means that "Plus" can always be pronounced with a 's'?

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I wondered exactly the same thing as Mohit did. I think I was taught that this type of "s" SHOULD NOT be pronounced unless there occurs liaison. 
Is this an exception only for this phrase? Or is it more flexible in general...?