
Answer:
66000
Step-by-step explanation:
Total ways of selecting 2 seniors from 6 is 6C2
and Total ways of selecting 3 juniors from 6 is 6C3
ways of selecting rest 9 from 12 sopho or fresh is 12C9
now, total way of selection come to be
12C9Ă—6C3Ă—6C2
i.e, 220Ă—20Ă—15
i.e, 66000