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This is a magic trick done using two Arduinos.

One Arduino is a random# generator, the other Arduino will identify a random # chosen by the audience.

Please watch the video. It’s easier shown than explained. :-(

Any two Arduinos (I used two Arduino Nanos)
Any two or more digit 7-segment display. Sketch is coded for common anode, but it would be simple to modify the sketch for common cathode.
Fourteen 220 ohm resistors
Two momentary push button switches
One numeric keypad
Two breadboards and a handful of jumper wires”

Link to article