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Numbers of all permutations of the set of four letters E, O, S, P taken two at a time is

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Important Questions on Permutations and Combinations

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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 37
In a badminton tournament each player played one game with all the other players. Number of players participated in the tournament if they played 105 games is
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 38
Number of ways in which 5 plus + signs and 5 minus - signs be arranged in a row so that no two minus signs are together is
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 39
Find the number of ways in which a person can buy 6 chocolates, if there are three types of chocolates available. (Chocolates of same type are identical)
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 40
Cr+1n+Cr-1n+2Crn=
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 41
On the eve of new year each student of class XI sends cards to his classmates. If there are 40 students in the class number of cards exchanged during the process is
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 42
A box contains 3 red, 4 white and 2 black balls. The number of ways in which 3 balls can be drawn from the box, so that at least one ball is red (all balls are different).
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 43
In how many ways 6 students and 4 teachers be arranged in a row so that no two teachers are together?
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 44
Eight chairs are numbered 1 to 8. Two women and three men wish to occupy one chair each. First the women choose the chairs from amongst the chairs marked 1 to 4; and then the men select the chairs from amongst the remaining. The number of possible arrangements is :