please solve all the questions

1. A combinational circuit is defined by the following functions Fl(z,y,x)= (0,1,2,5,7) F2(x,y,z)= xy'+ xyz'+ y'z'+ x'y'z Design the circuit using one 3 to 8 decoder and 2 OR gates. 2. Design a combinational circuit whose input is an integer number in the range[0,7] represented in binary notation and whose output is 10 more than the triple of the input number represented in binary form. 3. Design 3-bit magnitude comparator using 3, 1-bit magnitude comparators and some external gates. 4. Design 1 bit full adder using only 2-input NOR gates