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A person has n friends. The minimum valu...

A person has `n` friends. The minimum value of `n` so that a person can invite a different pairs of friends every day for four weeks in a row is _____.

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CENGAGE ENGLISH-PERMUTATIONS AND COMBINATIONS-All Questions
  1. The sum of all the numbers of four different digits that can be mad...

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  2. The sum of digits in the unit's place of all numbers formed with th...

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  3. A person has n friends. The minimum value of n so that a person can in...

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  4. There are n distinct white and n distinct black ball. If the number ...

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  5. Numbers from 1 to 1000 are divisible by 60 but not by 24 is .

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  6. If the number of ways in which the letters of the word ABBCABBC can...

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  7. A class has three teachers, Mr. P , Ms. Q, and Mrs. R and six stude...

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  8. Column I, Column II The number of five-digit numbers having the ...

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

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

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

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

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

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

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

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

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

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

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  19. 2m white counters and 2n red counters are arranged in a straight line ...

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

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