Q) Check whether :Z×Z→Z×Z (where Z is the set of integers) defined as f(𝑥,y)=(2y,3𝑥) is injective

Q) If 𝑓:𝑁→𝑊 is defined as f(n)={(n/2, if n is even g0 if n is odd ) then f is :(A) injectiv