Rohan goes to play and won. Explain?

Question

A betting company organized a betting game. According to the game, two marbles (one red and one blue) will be placed in a dark box and if the player picks blue marble, he will get 5000$ and if he guessed it wrong he needs to pay 100$. The company was a cheater and every they put two red balls instead of one red and one blue.

Rohan was observing that all the players are losing the game.

Next Rohan goes to play and won. Explain?

Answer 1

1. He should pick the ball from any one of the other dark boxes to expose the company.

2. He should pick 2 balls and hide it in his fists. Then he should show everyone his second choice which will be red (both of them are red), which means in the crowds eyes he must have picked the blue ball first.