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ANSWER
EXPLANATION
From the Pascal's triangle,
The coefficients are :
1, 5, 10,10, 5,1
Because of the negative sign, the expansion will alternate sign.
We now put y=5 into the expansion to get,
Let's call animals "a", and birds "b", birds of prey, "p"
so, b=
and p=
what;s the relation of p to a?
we substitude b into the last one:
and p=
so:
p=
p=
p=
p=
which is the answer!
so, b=
and p=
what;s the relation of p to a?
we substitude b into the last one:
and p=
so:
p=
p=
p=
p=
which is the answer!