How many 3-to-8 line decoders with an enable input are needed to construct a 6-to-64 line decoder without using any other logic gates?
7
8
9
10
Hi.. 8 decoders will be needed. that's fine. but we also have to select one of the 8 decoders. for that we need 1 more 3-8 decoder which will select one among the 8 decoders. so totally we need 9 3-8 decoders.