Question

The minimum number of flip-flops needed to make mod-2 counter is

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is A 1

For mod-2 counter there are only two state, so required number of flip-flops are
$N\le 2^n$
$2\le 2^n$
$so,n=1$
one FF is required.