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How many different numbers of six digits...

How many different numbers of six digits each can be formed from the digits 4, 5, 6, 7, 8, 9 when repetition of digits is not allowed?

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RD SHARMA ENGLISH-PERMUTATIONS-All Questions
  1. Find the number of 4 digit numbers that can be formed using the digits...

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  2. How many four digit natural numbers not exceeding the number 4321 can ...

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  4. Serial numbers for an item produced in a factory are to be made using ...

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  5. From among the 36 teachers in a college, one principal, one vice-pr...

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  6. In how many ways can 6 persons stand in a queue?

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  7. There are five books on Mathematics and 6 books on Physics in a book ...

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  8. Seven athletes are participating in a race. In how many ways can the ...

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  9. If a group of n distinct objects, the number of arrangements of 4 obj...

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  10. If the letters of the word ‘MOTHER’ are written in all possible orders...

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  11. In a room there are 12 bulbs of the same wattage, each having separate...

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  12. How many different signals cab be given using any number of flags from...

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  13. It is required to seat 8 men and 4 women in a row so that the women ...

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  14. If P(n ,4)=20xxP(n ,2),find n.

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  15. If P(n ,4)=18xxP(n ,3), find n

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  16. If P(n ,4)=20xxP(n ,2), then find the value of n

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  17. If P(n ,4)=20 x P(n ,2),find n.

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  18. In how many ways can 6 persons stand in a queue?

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  19. Seven athletes are participating in a race. In how many ways can the ...

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  20. If 22P(r+1):^(20)P(r+2)=11 : 52 ,find r

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