Because there are so many different values of numbers, it would be impractical to use 1Ω, 2Ω, 3Ω... etc... Using colored bands helps make reading it a little easier to the trained eye. There are hundreds of thousands, if not tens of millions of different resistors would need to exist to cover every value. So you just use something called "preferred values" with their resistance values posted on them instead.
Is go be 4x=7 so when you see yo thing pick the 2nd one it's go be b
Answer is in the photo. I can only upload it to a file hosting service. link below!
tinyurl.com/wpazsebu
