How you can make 4 to 16 decoder by 2 to4?

To create a 4-to-16 decoder using 2-to-4 decoders, you can use four 2-to-4 decoders in a hierarchical structure. First, take the two most significant bits (MSBs) of the 4-bit input to select one of the four 2-to-4 decoders. Each of these decoders will then decode the two least significant bits (LSBs) of the input, generating a unique output corresponding to the 4-bit input combination. This setup allows you to produce 16 unique outputs based on the 4-bit input.