In problem 9, the bits are counted starting from zero. So we have the 0th bit, 1st bit, 2nd bit, 3rd bit, 4th bit, and so on. The problem is asking for the 4th bit.
In problem 9, the bits are counted starting from zero. So we have the 0th bit, 1st bit, 2nd bit, 3rd bit, 4th bit, and so on. The problem is asking for the 4th bit.