JEE Main 20202 Sep, Morning shiftMathematicsMediumStatistics and Probability258× since 2002
Box I contains 30 cards numbered 1 to 30 and
Box II contains 20 cards numbered 31 to 50. A
box is selected at random and a card is drawn
from it. The number on the card is found to be
a non-prime number. The probability that the
card was drawn from Box I is :