Data Sufficiency

p3

x(y+1) is even ?

stmt 1: x & y are prime

if x=2 y any other prime then it is even

but if x =3 & y= 2 then it is not INSUFF

stmt 2: y>7 then y+ 1 may be even & may be odd & also x may be & odd

so still possibilty of both odd is there INSUFF

Combine:

y>7 & prime means y is odd henec y+1 is even so x(y+1) is even

SUFF