GATE | GATE-CS-2007 | Question 85
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?
So total signals in=a, b, c, x, y, z i.e. 6
And total output =8*8=64
hence required decoders (from fig.) = 9 so ans is ( C) part.
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