1) x-3y is oddsud21 wrote:Is x+3y even?
1). x-3y is odd
2). x-y is odd
=>
x y can be O E or E O respectively.
for both conditions we get x+3y as odd. so suff.
2) x-y is odd
=>
x y can be O E or E O respectively.
for both conditions we get x-y as odd. so suff.
IMO D
user123321
