if r and q are +ve integers are they both greater than n
(1) p-q>n.insuff as can be seen on examples
p=6,q=2,n=3
p-q=6-2=4>3, but q<n, 2<3
p=6.q=2.n=1
p-q=6-2=4>1, and n is less that both p and q
(2) q>p no info about n also insuff
both
p-q>n
q>p sum both
p-q+q>n+p and cancel all but n and left with n<0 as n is -ve and p and q are both +ve so n must be less, both are suff
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