Answer:
Counter example to show that given conjecture is false.
Explanation:
We are given a conjecture:
All mammals are monkeys.
We have to provide a counter example to show that this conjecture is false.
Since elephants are mammals, thus it will lie in the set of all mammals.
So we can write:
Elephants are monkeys which is false as it is obvious that elephants are not monkeys.
Hence, the given conjecture is false that all mammals are monkeys.