Please explain how none is correct

#1

Explanantion required. what is meant by none. is it runtime error?

#2

hello @pd.pankajdahiya

please share the question as well.

#3

Q4. bitmask index of on lsb Which one line function can be used to get index of the least significant bit that is on (first 1 from right to left in binary representation of an integer) ? log2( N ^ -N ) + 1 log2( N | -N ) + 1 log2( N & -N ) + 1 log2( N ~ -N ) + 1

#4

explanation of solution needed.

#5

N&-N will return the place value of lsb
now if you take log and add +1 it will definetly give you index of lsb