1.(a)Design a combinational circuit that multiplies by 5 an input decimal digit represented in BCD. The output is also i

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1.(a)Design a combinational circuit that multiplies by 5 an input decimal digit represented in BCD. The output is also in BCD. Show that the outputs can be obtained from the input lines without using any logic gates.(b).Design a combinational circuit to check for even parity of four bits. A logic-1 output is required when the four bits do not constitute an even parity.(c)Implement a full-subtractor with two half-subtractors and an OR gate.