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In nPr , the restriction is
  • a)
    n > r
  • b)
    n ≥r
  • c)
    n ≤ r
  • d)
    none of these
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In nPr , the restriction isa)n > rb)n ≥rc)n ≤ rd)none ...
The expression nPr refers to the number of permutations of r objects selected from a total of n objects.
The formula for permutations is:
    P(n, r) = n! / (n - r)!
    
In order for this formula to be valid, the value of n must be greater than or equal to r. This is because we cannot select more objects than we have available. Therefore, the restriction is:
n ≥ r (Option B)
So, for the permutation formula nPr to work, it is required that n ≥ r.
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Most Upvoted Answer
In nPr , the restriction isa)n > rb)n ≥rc)n ≤ rd)none ...
Explanation:
nPr stands for permutation of n objects taken r at a time. In other words, it is the number of ways in which r objects can be selected from n distinct objects, where the order of selection matters.

The restriction in nPr is that we can select only r objects out of n objects, and the order of selection matters. This means that we cannot select more than r objects or less than r objects, and we have to select them in a specific order.

Therefore, the correct answer is option 'B', which states that the restriction in nPr is n≥r. This means that we need at least r objects to select from a total of n objects.
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Community Answer
In nPr , the restriction isa)n > rb)n ≥rc)n ≤ rd)none ...
In case of permutations and combinations r observations are selected from set of n observations
eg take n=7 r=5,
5 observations can be selected from set of 7 observations but, 7 observations can't be choosen from set of 5 observations
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In nPr , the restriction isa)n > rb)n ≥rc)n ≤ rd)none of theseCorrect answer is option 'B'. Can you explain this answer?
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