If the 2's complement representation of a number is (011010)₂ , what is its equivalent hexadecimal representation?       

Since the number has 6 bits, group the bits into two groups of 4 bits (add leading zeros if needed):
$$ (011010)_2 = (00011010)_2 $$

Now, split into two nibbles (4 bits each):
$$ 0001 \quad 1010 $$

Convert each nibble to hexadecimal:
- \(0001_2 = 1_{16}\)
- \(1010_2 = A_{16}\)

Therefore, the hexadecimal representation is: 1A