Answer:
100101100010101
Explanation:
Assuming 4b15 is hexadecimal, you can easily convert it to binary by using this lookup table (you will be extra geek if you memorize it):
0=0000
1=0001
2=0010
3=0011
4=0100
5=0101
6=0110
7=0111
8=1000
9=1001
a=1010
b=1011
c=1100
d=1101
e=1110
f=1111
