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
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