GMAtPREP test 2 #4

[akacharlie]

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.

[Neo2000]

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

[akacharlie]

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...