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The letters of the word OUGHT are writte...

The letters of the word OUGHT are written in all possible order and these words are written out as in a dictionary. Find the rank of the word TOUGH in this dictionary.

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PATHFINDER-PERMUTATION AND COMBINATION-QUESTION BANK
  1. If ^nPr = ^nP(r + 1) and ^nCr = ^nC(r - 1) find the value of n and r.

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  2. Solve the inequality .^(n-1)C4 - .^(n -1)C3 - 5/4 .^(n-2)C2lt 0,n in ...

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  3. The letters of the word OUGHT are written in all possible order and th...

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  4. How many numbers of 5 digits can be made with the digits 0,1,2,3,4,5 w...

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  5. There are 2n guests at a dinner party. Supposing that the master and m...

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  6. n different things are arranged around a circle. In how many ways can ...

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  7. How many integers between 1 and 10,00,000 have the sum of the digits e...

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  8. Let Tn denotes the number of triangles which can be formed using the v...

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  9. If .^nc(r-1)=10,.^nc(r)=45 and .^nc(r+1)=120 then r equals

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  10. The total number of five digit numbers of different digits in which th...

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  11. The number of ways in which 7 persons can be seated at a round table i...

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  12. Number of divisors of the form 4n+2(nge0) of the integer 240 is

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  13. Total number of words formed by using 2 vowels and 3 consonants taken ...

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  14. If 5 parallel straight lines are intersected by 4 parallel straight li...

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  15. Everybody in a room shakes hand with everybody else the total number o...

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  16. Given that n is the odd the number of ways in which three numbers in A...

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  17. The total number of numbers that can be formed by using all the digits...

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  18. The number of arrangements two letters of the word BANANA in which two...

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  19. The maximum number of points of intersection of 8 straight lines is

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  20. The letters of the word COCHIN are permuted and all the permutations a...

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