Question

which among the following a valid binary number ...............​

Answer 1

Answer:

0 and 1 are binary numbers

Answer 2

Answer:

A binary number can only have 0 or 1 as it's digits

So if any other number came in the options you can say that's invalid

for example I will give u a question

Which binary number is invalid??

a) 11110001010

b) 101000011

c) 1200013111

d) 11111110

Answer

1200013111

it contains the invalid digit in binary numbers that is 2.