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The number of ways in which we can selec...

The number of ways in which we can select four numbers from 1 to 30 so as to exclude every selection of four consecutive numbers is a. `27378` b. `27405` c. `27399` d. none of these

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CENGAGE ENGLISH-PERMUTATIONS AND COMBINATIONS-All Questions
  1. Column I, Column II The number of five-digit numbers having the ...

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  2. The number of words of four letters containing equal number of vowe...

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  3. The number of ways in which we can select four numbers from 1 to 30...

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  4. The total number of three-letter words that can be formed from the ...

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  5. The number of different seven-digit numbers that can be written usin...

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  6. The number of ways of arranging m positive and n(lt m+1) negative si...

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  7. The number of ways to fill each of the four cells of the table with...

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  8. A library has a copies of one book, b copies each of two books, ...

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  9. Three boys of class X, four boys of class XI, and five boys of clas...

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  10. Number of ways in which 25 identical things be distributed among fi...

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  11. Number of ways in which Rs. 18 can be distributed amongst four pers...

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  12. 2m white counters and 2n red counters are arranged in a straight line ...

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  13. A person buys eight packets of TIDE detergent. Eachpacket contains one...

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  14. There are three copies each of four different books. The number of ...

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  15. The number of ways in which 12 books can be put in three shelves wi...

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  16. The total number of ways in which 2n persons can be divided into n ...

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  17. Let x1 , x2 , x3,....., xk be the divisors of positive integer n (inc...

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  18. Let A = {x1, x2, x3, ,x7},B={y1, y2, y3} The total number of func...

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  19. The total number of ways in which n^2 number of identical balls...

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  20. Six X ' s have to be placed in thesquares of the figure below, such th...

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