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

Evaluate the following:
`""^(20)C_(1)=`

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NEW JOYTHI PUBLICATION-PERMUTATIONS AND COMBINATIONS-QUESTIONS FROM COMPETITIVE EXAMS
  1. A student is to answer 10 out of 13 questions in an examination such t...

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

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

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

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

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

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

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  8. Evaluate the following: ""^(10)C(3)=

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  9. The number of permutations of the letters of the word 'CONSEQUENCE' in...

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  10. If n = 5, then (""^(n)C(0))^(2)+(""^(n)C(1))^(2)+(""^(n)C(2))^(2)+.......

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  11. Let n be a natural number. Then the range of the function f(n)=""^(8...

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  12. The number of ways in which 5 ladies and 7 gentlemen can be seated in ...

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  13. The number of four-letter words that can be formed (the words need not...

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  14. All the words that can be formed using alphabets A, H, L, U, R are wri...

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  15. The value of (""^(7)C(0)+""^(7)C(1))+(""^(7)C(1)+""^(7)C(2))+...+(""^(...

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  16. Total number of four digit odd numbers that can be formed using 0, 1, ...

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  17. Evaluate the following: ""^(10)C(9)=

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  18. The number of positive integers less than 40,000 that can be formed by...

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  19. If ""^(56)P(r+6):""^(54)P(r+3)=30800:1, then the value of r is

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  20. From 12 books, the difference between number of ways a selection of 5 ...

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