Questions
A draws a card from a pack of n cards marked 1,2,……..n. The card is replaced in the pack and B draws a card. Then the probability that A draws a higher card than B is
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Correct option is C
If A draws card higher than B, then the number of favorable cases is (n−1)+(n−2)+⋯+3+2+1 (as when B draws card number 1, then A can draw any card from 2 to n and so on). Therefore, the required probability is n(n−1)2n2=n−12nSimilar Questions
The odd against an event are 5 to 2 and the odds in favour of another disjoint event are 3 to 5. Then the probability that atleast one of the events will happen is
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