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...........are the numbers of 7 digit fo...

...........are the numbers of 7 digit formed by digits 3,4,5,4,5,5 and 9.

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420
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KUMAR PRAKASHAN-OBJECTIVE SECTION AS PER NEW PAPER SCHEME -Permutations and Combinations (Fill in the blanks )
  1. n((n-1)P((r-1)))=................ .

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  2. ...........are the total numbers of ways to make a password of 5 digit...

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  3. ...........are the numbers of 7 digit formed by digits 3,4,5,4,5,5 and...

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  4. ""(n)Pr+((n),(r))=.........

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  5. If ((n),(12))=((n),(8)) then n = ........ .

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  6. If ""^(n)C(9)=""^(n)C(8), find ""^(n)C(17).

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  7. If ((20) ,(r))=((20),(r+2)) then ((r),(2))=........ .

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  8. Number of diagonal of the polygon having 10 sides = ............

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  9. The numbers of rectangle formed by m horizontal and n vertical line ar...

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  10. If ((79),(r)) is maximum then r = .......... .

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  11. There are 21 points on circle . The number of chord by joining there p...

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  12. If ((2n),(3)) = 11 ((n),(3)) then n = .....

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  13. If ((2n),(3))div((n),(2))=12 then n = .......

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  14. A person has one currency not each of Rs 500, Rs 100, Rs 50 , Rs 20 a...

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  15. ............are the numbers of words using the letters of word ROSE wi...

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  16. Evaluate (n!)/(r!(n-r)!), when n = 5, r = 2.

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  17. If (1)/(8!)+(1)/(9!)=(x)/(10!), find x.

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  18. 6P3 - 5P2 = ......... .

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  19. (nP4)/((n-1)P4) =5/3 then n = ......... (where n gt 4 )

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  20. If (n +1 ) ! = 12 (n-1) ! then n = ........... n in N

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