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How many different five digit numbers ca...

How many different five digit numbers can beformed from the digit 1,2,3,4 and 5 if the number is even and repetitions are allowed :

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MAHAVEER PUBLICATION-PERMUTATIONS AND COMBINATIONS -QUESTION BANK
  1. How many different five digit numbers can beformed from the digit 1,2,...

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  2. How many different five digit numbers can beformed from the digit 1,2,...

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  3. How many different five digit numbers can beformed from the digit 1,2,...

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  4. How many different five digit numbers can beformed from the digit 1,2,...

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  5. Find the value : 5! - 3!

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  6. Find the value : (7!)/(4!)

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  7. Find the value : 3! xx (7!)/(5!)

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  8. If n is a natural number then show that n! + (n+1)! = (n+2)n!

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  9. If n is a natural number then show that 1.3.5.7…..(2n-1) = ((2n)!)/(2^...

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  10. If ""^(56)P(r+ 6):""^(54)P(r+3) = 30800, find ""^(r)P(2).

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  11. Prove that ^n Pr-5^n Pr+r^(n-1)P(r2-1)dot

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  12. How many 9 letters words can be formed using the letters of the word "...

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  13. A child has four pocket and three marbles. In how many ways can the ch...

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  14. Find the value : "^6C3

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  15. Find the value : "^5C4 + ^7C4

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  16. Find the value : "(^7C3)/(^3C2)

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  17. If .^(n)C(r-1)=36, .^(n)C(r)=84 and .^(n)C(r+1)=126, find n and r.

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  18. How many ways 3 students can be selected from 50 students ?

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  19. In how many ways can 11 players be selected from 14 players if (i) a...

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  20. In how many ways can 11 players be selected from 14 players if (i) a...

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