Answer :

**(a)** It is given in the question that,

Total number of students = 1800

Number of students opted basketball = 750

Also,

Number of students opted cricket = 800

Therefore,

Number of students opted table tennis = Total students – (Number of students opted basketball + Number of students opted cricket)

= 1800 – (750 + 800)

= 1800 – 1550

= 250

Hence,

Required ratio =

=

=

**The ratio is 3:1.**

**(b)** It is given in the question that,

Total number of students opting cricket = 800

Also,

Number of students opted basketball = 750

Required ratio =

=

**The ratio is 16:15.**

**(c)** It is given in the question that,

Number of students opted basketball = 750

Also,

Total number of students = 1800

Therefore,

Required ratio =

=

= **The ratio is 5:12.**

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