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Answer :

Aayushastha06go

Step-by-step explanation:

let H and F be the sets of students who like hockey and football respectively.

here,

  • total number of students n(U)=99
  • n(H)=46
  • n(F)=42
  • n(H n F)=17

then,

n(H U F)=n(H) + n(F) - n(H n F)

=46+42-17

=88-17

=71

now,

n(H U F)' = n(U) - n(H U F)

=99-71

=28..

Therefore, the number of students who don't play both games are 28.

I hope this will be helpful for you....

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