This is my question please give me a help to find answer

Let V be the set of ordered pairs (a, b) of real numbers. Show that V is not a vector space over $\displaystyle \mathbb{R}$

with vector addition and scalar multiplication defines by:

01. (a, b) + (c, d) = (a + c, b + d) and k(a, b) = (a, kb)

02. (a, b) + (c, d) = (a + c , b + d) and k (a, b) = (o , kb)

03. (a, b) + (c, d) = (ac, bd) and k(a, b) = (ka, kb)