How many bit strings contain exactly eight 0s and 10 1s if every 0 must be immediately followed by a 1?

Here we will use the concept of combination and the formula for combination is given by

C(n,r) = n!/r!(n-r)!

There are 10 position and choose two position for the 1s that is there are 10 slots to fill and 2 of them must hold 1s