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Compute (i) (7!)/(5!) (ii) (12!)/((10!)...

Compute (i) ` (7!)/(5!)` (ii) `(12!)/((10!)(2!)`

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The correct Answer is:
(i) 42, (ii) 66
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KUMAR PRAKASHAN-PERMUTATIONS AND COMBINATIONS-TEXTBOOK ILLUSTRATIONS FOR PRACTICE WORK
  1. Find the number of different signals that can be generated by arrangin...

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  2. Evaluate : (i) 5 ! (ii) 7 ! (iii) 7 ! - 5 !

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  3. Compute (i) (7!)/(5!) (ii) (12!)/((10!)(2!)

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

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

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  9. Find the value of n such that, ""^(n)P(2)=30

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  10. Find r, if 5""^(4)P(r)=6""^(5)P(r-1)

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  17. How many words, with or without meaning, each of 3 vowels and 2 conso...

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