How many select lines are required for an 8-to-1 multiplexer?

The number of select lines (n) required for a multiplexer is determined by the number of input lines (M) using the following formula:

2n = M

For an 8-to-1 multiplexer:

• The number of inputs (M) is 8.

• We need to find n such that 2n = 8.

• Since 23 = 8, the number of select lines required is 3.