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24 Dec 2007, 03:47
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N
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If x is a positive integer, is x! + (x + 1) a prime number?
(1) x < 10
(2) x is even
(1) x < 10
(2) x is even
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24 Dec 2007, 06:08
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dynamo
From (i)
x = 1,2,3,4,5,6,7,8,9.
If you check a few;
x=1..... will give 3 which is prime
x=2 will give 5 which is prime
but not all lead to give prime.
x=3 gives 10 ( not prime)
Insufficient
from (ii)...we get nothing
combining... (i) and (ii) will not give any result
thus answer should be "E"
