can u describe this problem in brief
Can u describe this problem in brief
In the question it is already given that there are a total of 20 tails. So if you separate any 20 coins. And say if in that 20 coins x are tails and 20-x are heads. Then in the remaining coins only 20-x tails would be there. if you flip all the coins in that 20 coins, you will get x heads and 20-x tails. Which is same as the number of tails in the remaining coins.
Hope you understand