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If ""^(4)C(r)=""^(4)C(r+1), then the val...

If `""^(4)C_(r)=""^(4)C_(r+1)`, then the value of r is

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`3/2`
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NEW JOYTHI PUBLICATION-PERMUTATIONS AND COMBINATIONS-QUESTIONS FROM COMPETITIVE EXAMS
  1. The number of ways in which 5 boys and 3 girls be seated in a row so t...

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  2. If n and r are two positive integers such that nger,"then "^(n)C(r-1)+...

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  3. If ""^(4)C(r)=""^(4)C(r+1), then the value of r is

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  4. The number of straight lines that can be formed by joining 20 points o...

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  5. The number of ways in which a committee of 6 members can be formed fro...

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  6. Evaluate the following: ""^(20)C(4)=

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  7. Let N be the number of quadratic equations with coefficients from {0, ...

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  8. If ""^(n)C(3)=220, then n = ?

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  9. A polygon has 54 diagonals. Number of sides of this polygon is

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  10. In how many ways can 8 students be arranged in a row?

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  11. The number of different permutations of the word word 'BANANA' is

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  12. Rank of the word " MOTHER " is

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  13. Six X's have to be placed in the squares of the figure below, such tha...

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  14. A student is to answer 10 out of 13 questions in an examination such t...

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  15. The value of sum(n=1)^(oo)(""^(n)C(0)+.......+""^(n)C(n))/(""^(n)P(n))

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  16. Evaluate the following: ""^(20)C(1)=

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  17. The number of triangles which can be formed by using the vertices of a...

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  18. Evaluate the following: ""^(15)C(2)=

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  19. The number of ways in which 21 objects can be grouped into three group...

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  20. Evaluate the following: ""^(105)C(0)=

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