GMAtPREP test 2 #4

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akacharlie: Newbie | Next Rank: 10 Posts; Posts: 3; Joined: Mon Feb 05, 2007 5:25 am

by akacharlie » Sat Aug 25, 2007 4:59 am

n, p are integers, is p>0

1) n+1>0
2) np>0

Can someone explain me how to come to the conclsion that (1) and (2) together are sufficient?

Thanks.

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Source: Beat The GMAT — Data Sufficiency | Sat Aug 25, 2007 4:59 am

Neo2000: Legendary Member; Posts: 519; Joined: Sat Jan 27, 2007 7:56 am; Location: India; Thanked: 31 times

Re: GMAtPREP test 2 #4

by Neo2000 » Sat Aug 25, 2007 8:08 am

akacharlie wrote:n, p are integers, is p>0

1) n+1>0
2) np>0

Can someone explain me how to come to the conclsion that (1) and (2) together are sufficient?

Thanks.

From 1 Alone
n > (-1) since its an integer n is >= 0 but that doesnt tell anything abt p

From 2 Alone
I get nothing interesting

Combining 1 and 2
If np >0 and we know that n >=0 so then n has to be > 0 and p also has to be > 0

Hence Combining both we get the answer

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akacharlie: Newbie | Next Rank: 10 Posts; Posts: 3; Joined: Mon Feb 05, 2007 5:25 am

by akacharlie » Sun Aug 26, 2007 2:50 am

Thanks for the answer

sometime I forget some very important details. Here I forgot n is an integer thus n > -1 is the same as n >=1...

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