Explanation needed, why will we consider those below 70,as explained in the solution??

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Explanation needed, why will we consider those below 70,as explained in the solution??
There are 77 posts in [2018] TIME AIMCAT 1907 (5th October to 8th October)
same doubt. less than 70% students don't secure any certificate so why keep them in consideration?
Because they haven't said in how many ways could a student get at least one certificate. They're asking for the whole set.