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The number of rectangles, of any size excluding squares from the rectangle of size 8×7 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 52
There are four balls of different colours and four boxes of colours, same as those of balls. The number of ways in which the balls, one each in one box, colud be placed such that any ball does not go to the box of its own colour, is
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 53
Ramya gives a dinner party for 5 guests. The number of ways in which they may be selected from among 9 friends if two of the friends will not attend the party together is
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 54
At an election, a voter may vote for any number of candidates not greater than the number to be elected. There are 10 candidates and 4 are to be elected. If a voter votes for at least one candidate, then the number of ways in which he can vote, is
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 55
The number of ways in which a composite number N=22325272 can be resolved into two factors which are prime to each other is
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 56
The sum of all five-digit numbers that can be formed using the digits 1,2,3,4,5 when repetition of digits is not allowed, is
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 57
The number of ways of selecting 8 books from a library which has 9 identical books each on Mathematics, Physics, Chemistry and English is
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 58
How many numbers greater than 1000 but not greater than 4000 can be formed the digits 0,1,2,3,4, repetition of the digits being allowed?
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Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 59
The total number of ways in which four boys and four girls can be seated around a round table, so that no two girls sit together is equal to