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How many different numbers lesser than 10000 can be formed from the digits 0,1,3,6,8,7 and 9, if no digit is repeated ?

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  4. How many numbers can be formed with digits 3,4,6,and 8 without repetit...

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  5. Evaluate the following: (i) 6! -5! (ii) (30!)/(28!) (iii) (15!)/(...

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  6. Evaluate : (1)/(3!)+(1)/(4!)+(1)/(5!)

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  7. Convert into factorials 3.6.9.12.15.18.21

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  8. Convert into factorials : 2.4.6.8.10.12……..50

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  9. Evaluate : (n!)/((n-r)!) where n=5,r=2

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  10. Evaluate (n!)/(r!(n-r)!), where n=15,r=4

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  11. Evaluate ""^(20)P(3)

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  12. Evaluate ""^(5)P(3)xx""^(7)P(3)

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  13. Find n, if ""^(n)P(5)=42 ""^(n)P(3), n ge 5

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  14. Show that ""^(n)P(n)=2""^(n)P(n-2)

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  15. In how many ways, the letter of word NUMBER can be arranged ?

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  16. In how many ways, the letters of word FRACTION can be arranged ?

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  17. How many numbers lying between 100 and 1000 can be formed with the dig...

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  18. How many four digit numbers are there in all?

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  19. How many permulations of the letters of the word KARNAL are there ?

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