Probability Of Head Count

Hard
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Given n tosses, probability of exactly k heads as reduced fraction....

Expected Value Of Dice

Easy
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Expected sum of rolling one fair die....

At Least One Success

Hard
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Given n independent trials with success probability p (as a/b), find prob of at least one success....

Two Dice Sum Equals S

Medium
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Probability that sum of two fair dice equals S....

Conditional Probability Simple

Easy
3 views 25 Jan 2026
A bag has r red and b blue balls. One ball is drawn. Prob it is red....