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# N, R both are positive integer and permutations P(N,R)

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Manager
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N, R both are positive integer and permutations P(N,R) [#permalink]

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03 Jun 2006, 03:45
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24. N, R both are positive integer and permutations P(N,R) represents N!/(N-R)! what is the minimum number of R that makes P(N,R) less than 1000?

A. 1 B. 2 C. 3 D . 4 E. 5
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03 Jun 2006, 05:57
itishaj wrote:
24. N, R both are positive integer and permutations P(N,R) represents N!/(N-R)! what is the minimum number of R that makes P(N,R) less than 1000?

A. 1
B. 2
C. 3
D . 4
E. 5

your question is either incomplete or incorrect. it all depends the value of N. R could be many times the ACs given.
Manager
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03 Jun 2006, 06:44
ur question may b incorrect.bcoz the value of p(n,r) depends on n.

BUT,if u r sure tht ur queston is correct,i can say that the answer is A.

this is b'coz find the minimum possible value of 'r' for which the value of
p(n,r)<1000.

consider 1.
then p(999,1)=999<1000

of the given numbers in the list 1 is the minimum hence we can end up with A.
will b waiting 4 ur OA and OE
Manager
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03 Jun 2006, 20:27
parvathaneni wrote:
ur question may b incorrect.bcoz the value of p(n,r) depends on n.

BUT,if u r sure tht ur queston is correct,i can say that the answer is A.

this is b'coz find the minimum possible value of 'r' for which the value of
p(n,r)<1000.

consider 1.
then p(999,1)=999<1000

of the given numbers in the list 1 is the minimum hence we can end up with A.
will b waiting 4 ur OA and OE

The OA is A only, hwever I dont hav the OE.
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