Answer:
# F F F F 0 0
# F F 0 0 F F
# 0 0 F F F F
Step-by-step explanation:
Hex values are your friend.
The first two digits represent red.
# F F 0 0 0 0 - Red
The second two digits represent green.
# 0 0 F F 0 0 - Green
The third two digits represent blue.
# 0 0 0 0 F F - Blue
If you know yellow is a combination of red and green, you express the corresponding digits.
# F F 0 0 0 0 - Red
# 0 0 F F 0 0 - Green
+
-------------------------------
# F F F F 0 0 - Yellow
Similarly,
If you know magenta is a combination of red and blue, you express the corresponding hex digits.
# F F 0 0 0 0 - Red
# 0 0 0 0 F F - Blue
+
-----------------------------
# F F 0 0 F F - Magenta
And finally,
If you know cyan is a combination of green and blue, you express the corresponding hex digits.
# 0 0 F F 0 0 - Green
# 0 0 0 0 F F - Blue
+
----------------------------
# 0 0 F F F F - Cyan
What does it mean to "express the digits"?
If you know anything about how color works on a computer, you'll know that you can express a certain amount of red, green and blue to get almost any color. These are known as "RGB" values. In RGB, the red, green or blue can individually go from 0 - 255. Think of it like a slider for how much you want of each color.
In RGB:
RGB (255, 255, 255) - White
Hex is just a really convenient and shorthand way to write the RGB color values.
In Hex:
#FFFFFF - White