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Quiz Show Scorer and Dispaly

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1234567890qwer

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Hi everyone,
I've got a project which i have build but seem to have a problems on the second part. For the first part i have designed and assembled a circuit so that which 3 Player push buttons PB is depressed first, that button turns On its respective LED and disables the other two LED's, i didn't have any problems with that.

For the second part of the circuit,the player that turned its respective LED On, should be able to have the count on the 7-segment LED changed by one, by simply depressing the Right Answer Counter Up (PB) or wrong Answer Counter Down (PB).I have a problem with this part i don't know how im going to build it please any advices.By the way i am using electronic work bench v5.12 to help me build this circuit thanks

Regards,
John
 
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