The pot of beans

Puzzle Question:

A pot contains 75 white beans and 150 black beans. Next to the

is a large pile of black beans. The cook pick up 2 beans at a time

and do the things with the following rules :

• If he gets atleast one black then he throws the black bean into the large

pile and other bean into the pot ( any colour).

• If he gets 2 white beans , then he discards them and also removes one

black bean from the pile and drops it into the pot.

At each turn of this procedure, the pot has one less bean in it.

Finally one bean is left in the pot. What colour is it??