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prime numbers

by Asif » Wed Jun 23, 2010 8:24 pm
if 1<P<20, then is P prime number?

i. 2+P is a prime number
ii. P not equals to 9
Last edited by Asif on Wed Jun 23, 2010 8:53 pm, edited 2 times in total.
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Source: — Data Sufficiency |
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by ayushiiitm » Wed Jun 23, 2010 8:38 pm
is this question complete?

sounds ambiguous
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by jaskaran » Wed Jun 23, 2010 11:52 pm
to me from the question stem, looks like answer is e

i) 2+p is a prime number, could be 3+2, 5+2, 11+2 which all make P to be prime, but 9+2 and 15+2, but P is not prime, hence I is not sufficient.

ii) P could be 15 still not sufficient.
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by Asif » Thu Jun 24, 2010 12:30 am
Yes Jaskaran, you are right. its e.

thanks.
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by outreach » Thu Jun 24, 2010 10:28 am
i
p can be 3,5,9,11,15,17
all numbers r not prime

insuff

ii
p can be 2,3...8 and 10....19
insuff


i and ii

p can be 3,5,11,15,17
15 is not prime while other are prime

hence insuff
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