JEE Main 20209 Jan, Morning shiftMathematicsMediumStatistics and Probability258× since 2002
In a box, there are 20 cards, out of which 10
are lebelled as A and the remaining 10 are
labelled as B. Cards are drawn at random, one
after the other and with replacement, till a
second A-card is obtained. The probability that
the second A-card appears before the third
B-card is :