BRAIN TEASER SOLUTION Place one white marble in the first jar and place the remaining 49 white and 50 black in the second jar. This placement of marbles results in a 4.75% change of drawing a white marble. The probability of selecting either jar is 0.5, the probability of drawing a white marble from one jar is 1 and from the other jar is 49/99. Therefore, 0.5(1) + 0.5(49/99) = 0.74747.