Probability Selecting Marbles

Problem A bag of marbles containing 4 white marbles and 6 red marbles. If we randomly select two marbles from the bag what is the probability that the selected marbles are of different colors in other words one white and …

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Playing Cards

Problem In playing cards what is the probability to get exactly one pair (for example (1,1), (2,2)) if we draw 5 cards Solution Step one is to compute how many possibilities we have if we draw 5 cards without any …

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Binomial Theorem Example

Subsets Using Binomial Theorem How many subsets we can make from the numbers between 1 and 5 Solution The naive way to compute that is to enumerate all possibilities as follows: Groups of 1: 1, 2, 3, 4, 5 Groups …

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Making Binary Numbers

Problem Given four binary digits all ones 1111 and two binary digits all zeros 00 we need to create a six digit binary number using these ones and zeros such that no two zeros are next to each other. How …

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Forming a Team

Problem A group of 4 boys and 3 girls. We want to form a team of 5 players. We are required to select 2 girls and 3 boys. If 2 boys can not play together. How many possible ways we …

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Color Signals

Problem You are given 1 red flag, 2 green flags and 3 blue flags. You are asked to generate 6 symbol based signals using these flags. How many signals you can generate. Solution This problem can be solved using permutations …

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California License Plate Numbers

Problem A typical car license plate number in California starts with a decimal digit then three capital letters then three decimal digits. If repetition is not allowed and we need to generate a license plate number randomly, what is the …

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