Problem 4: How many 3-to-8 decoders does it take to build a 5-to-32 decoder? Problem 5a: A decoder is used to implement functions fl, f2, f3 below: 12,13,15 12- - a) What kind of gate is used in the red boxes. ?, 2. b) What output connections does gate of fl gets from the decoder? _?,? c) What output connections does gate of f2 gets from the decoder? ?, ?, _? d) What output connections does gate of f3 gets from the decoder? _?, ?, ?, ?, ? Problem 5b: Given the circuit below, find the minimum SOP expression for SW,X,Y,Z). 4-10-16 Decode 1 6 7 10 11 GI 13 14 15 f(W,X,Y,Z) = m m ?)