Question

Q13) 20 marks
in a box you have 13 white marbles and 15 black marbles. You also have 28 back
marbles, randomly, from the box. If they are of different colors put the white one back to
take them out and put a black marble back in the box. Continue this untit only one male
color of the last marble?
Always two black marbles will be at the end
Black
White
Always two marbles - one black and one white will be at the end​

Answer 1

Answer:

The last marble will be WHITE.

Since marbles can only be taken out in pairs and you started off with an odd number of whites there is always going to be one white left over that you'll keep putting back in the box until it's left on it's own.