You can
put this solution on YOUR website! Copy and paste in your browser what you see below the dotted line.
Next time go to google.com and type in your problem there.
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https://www.google.com/search?q=use+nor+gates+only+convert+a+4+bit+bcd+code+to+excess+3+code&sca_esv=347ef560d6344a36&sxsrf=ANbL-n7UwT3s8u-WRpZrpbYPh_r_HSYCoQ%3A1777846783526&source=hp&ei=_8n3aZjqHdmz5NoPsMLmSQ&iflsig=AFdpzrgAAAAAaffYD-R7ztCsySQN6ZiEwGMJgQ4OqCYE&aep=22&ved=0ahUKEwjY5fqvk56UAxXZGVkFHTChOQkQteYPCBo&ictx=2&oq=&gs_lp=Egdnd3Mtd2l6IgBIAFAAWABwAHgAkAEAmAEAoAEAqgEAuAEByAEAmAIAoAIAmAMAkgcAoAcAsgcAuAcAwgcAyAcAgAgB&sclient=gws-wiz&udm=50&mstk=AUtExfB31Qe-lUUy11MU1DzjWwMeWTmdigWOTpnVZY8PHA-GppKF44hhvyH6N3OmKFpy6SFOMuhn6y4b_LHC0qA1qHA9Srig0cqDHx8owT3XkoUf3Ny5M1VH_957UoWaI60pOuoDfGbSHB8XMpYrAZ3oHTSUeAsVemLYY1AsTXbU6hBHyysRoCSeNPNGQsUNOrm1POnUUaBsJPaZ0f9QRWF3CDIRnB1YSl1bsyxGEEie3S4DwmzKsI_UONvDwVmh1rewHbVkWmw5Viud0uuqcvv-KWEf-JnFISpukPM&csuir=1&mtid=C8r3abf6J5Ck5NoP5sTVyAY