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The complete solution of |x+1|+|x-4|-gt...

The complete solution of `|x+1|+|x-4|-gt7` is `(-oo,-a)uu(b,oo)` where a and b are natural numbes then

A

`(a+b)` is an even number

B

`b` is a prime

C

a is a prime

D

`(a+b)` is an odd number

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